ACST101 Lecture Notes - Lecture 2: Interest, Cash Flow, Investment

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18 May 2018

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ACST101 LECTURE – 8/3/18

WK2; TIME VALUE OF MONEY

DEFINITIONS:

TVM: the difference in value between a dollar in hand today and a dollar promised in the

future.

Time Line: identifies the rate of interest, magnitude and timing of cash flows.

Future Value (FV): accumulated value. The value of an investment after it earns interest for

one or more periods.

Present Value (PV): the equivalent value at an earlier date (like today) of a future sum(s) of

money.

Simple Interest: interest earned on the original principal only.

Compound Interest: interest earned on the original principal and on the interest earned.

Siple iterest = iterest-on-iterest.

Compounding: process by which interest earned on an investment is reinvested, so in

future periods interest is earned on the interest as well as the principle.

Discounting: process by which the present value of future cash flow is obtained - reverse of

compounding.

COMPOUND INTEREST

FV=PV(1+r) ^n

FV: Future Value

PV: Present Value

r: Interest Rate

n: Number of Periods

SIMPLE INTEREST

I=Prn

I: Interest

P: Principle

r: Rate

n: Number of Periods

FUTURE VALUE AND COMPOUNDING

- The greater the interest rate the greater the FV

- The longer the time period, the greater the effect of compounding die to interest-

on-interest

- The opposite is true too – the greater the interest rate and time period, the less is

the present value of some future amount

- Compound interest does not grow to an infinitely large sum (unless the starting

amount is infinitely large)

- An upper bound exists for the amount of compound interest

- As the number compounding periods tends to infinity, compound interest tends to a

limit

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Document Summary

Tvm: the difference in value between a dollar in hand today and a dollar promised in the future. Time line: identifies the rate of interest, magnitude and timing of cash flows. The value of an investment after it earns interest for one or more periods. Present value (pv): the equivalent value at an earlier date (like today) of a future sum(s) of money. Simple interest: interest earned on the original principal only. Compound interest: interest earned on the original principal and on the interest earned. Compounding: process by which interest earned on an investment is reinvested, so in future periods interest is earned on the interest as well as the principle. Discounting: process by which the present value of future cash flow is obtained - reverse of compounding. Pv: present value r: interest rate n: number of periods. P: principle r: rate n: number of periods. The greater the interest rate the greater the fv.

Related Questions

CAN SOMEONE LET ME KNOW IF I DID THESE RIGHT?? PLEASE

1. What is the effective rate of interest for an investment paying 18% compounded monthly?

Effective rate of interest= (1+r)^n-1

r= 18% or .18; compounded monthly= 0.18/12

N= no of period ie 12

Effective rate r= (1+.18/12)^12-1

= 0.1956 ie 19.56%

2. If you want to buy a $25,000 car in 5 years, what single amount must you invest now at 10% compounded quarterly to have the money to pay cash?

Fv= PV(1+i)^n

Fv= 25,000 n=5 years so 5*4= 20 periods; r = 10% compounded quarterly ie .10/4

25,000=PV(1+.10/4)^20

25,000= PV (4.10/4)^20

PV= (25,000/1.025)^20

PV=$15,256.77

3. What is the present value of $50,000, 4 years from now at 12% interest compounded monthly?

Fv= Pv (1+r)^n

Fv=50,000; Pv?; n= 4 years compounded monthly ie 48; R= 12% compounded monthly ie .12/12

50,000= PV (1+.12/12)^48

PV=50,000/(1.01)^48

PV=$31,013.02

4. What is the future value of $5,000 in 15 years if you can earn 12% interest compounded semi-annually?

Fv=PV(1+i)^n

Fv=5,000; n=15 years semi annually= 30 periods; I=12% compounded semi annually=.12/2

5,000= PV (1+.12/2)^30

PV=5,000(1.06)^30

PV=$28,717.46

5. What is the future value of $800 deposited annually at 9% interest for 25 years if the deposits are made at the end of the period? And, if the deposits are made at the beginning of the period?

FV(end)= PMT[(1+i)^n-1)/i] (Ordinary annuity)

FV= $800; i=9% or .09; n=25 years

Fv+800[(1+0.09)^25-1)/0.09

FV=$67,760.72

FV=(beginning)= PMT[((1+i)^n-1)/i](1+r)

FV=$800; I=9% or 0.09; n=25 years

FV=800[(1+0.09)^25-1)/0.09)(1+0.09)

FV=$73,859.18

6. Using the information from the previous problem, how much more interest is earned from the annuity due than from the ordinary annuity?

Annuity due= annuity (beginning) - ordinary annuity

=$73,859.18-$67,760.72= $6,098.46

7. How much must be deposited now in order to withdraw $15,000 at the end of each year for 30 years, if interest is 11% compounded annually?

Annuity the end of each year= 15,000

N=30 years; r= 11% compounded annually

To find PV of an annuity of $15,000 @ the end of each of the year

PV= PMT [1-(I+i)^-n/i

PV=15,000[1-(I+0.11)^-30/0.11]

PV= PMT[1-(I+i)^-n/i

=$130,406.89

8. If you want $2,000,000 in your retirement fund in 45 years, and you can earn 14% compounded annually, what will be your annual contribution? How much interest will you earn?

FV= 2,000,000; N= 45 years; i= 14% compounded annually

We have the FV of an annuity â to find the annuity

FV= PMT [(I+i)^n-1)/i]

2,000,000=PMT [((1+0.14)^45-1)/(0.14]

2,000,000= PMT [2590.5648]

PMT=$772.03

9. If you retire with $1,375,000 in your retirement fund and plan to live for 20 years, how much can you withdraw every year if your investment earns 10%?

PV= 1,375,000 n=20 years i=10%

To find annuity given the PV

PV=PMT [1-(1+i)^-n/I]

1,375,000= PMT [1-(1+0.10)^-20/0.10)

PMT(yearly withdrawl) =$161,506.98

10. How much more interest is earned from ordinary annuity payments of $6,000 per year for 25 years if you can increase your rate of interest from 6% to 9%?

PMT=$6,000 per year; n=25 years; i=6% to 9%

Interest at 6%

FV= PMT [((1+r)^25-1)/0.06]

FV= 6,000[((1+0.06)^25-1)/0.06]

=$329,187.07

Interest at 9%

FV=6,000[(91+0.09)25-1)/0.09]

= $508,205.38

More earned interest 9%- 6% = $508,209.38 - $329,187.07 = $179,018.31

sapphiresnake702

Assume that you have $1,000 to invest, so insert 1000 as your Present Value in the following table. Assume that you want to invest your money for 5 years (insert 5 for Number of Periods). Assume an annual interest rate of 3.00% (insert 3 for Interest Rate per Period). The table will determine the Future Value of your investment. If you input the numbers correctly, your Future Value is computed to be $1.159, which is what your investment will be worth in 5 years. Now revise the input to reflect your actual savings and the prevailing interest rate so that you can see how your savings will grow in 5 years. Even if you have no savings now, you can at least see how the interest rate affects the future value of savings by revising your input in the Interest Rate per Period and then observing the change in the Future Value. Future Value of a Present Amount Present Value $1,500 Number of Periods 5 Interest Rate per Period 3.0% FV = PV*(1+R)^N Future Value $1,739 2. Assume that you have $1,000 to invest at the end of each of the next 5 years, so insert 1000 as your Payment per Period in the following table. Assume that you want to invest your money for 5 years (insert 5 for Number of Periods). Assume an annual interest rate of 3.00% (insert 3 for Interest Rate per Period). The following table will determine the Future Value of your investment. If you input the numbers correctly, your Future Value is computed to be $5,309, which is what your investments will be worth in 5 years. Now revise the input to reflect your actual expected savings per year over the next 5 years, and existing interest rate quotations so that you can estimate how your savings will grow in 5 years. You can now revise the table to fit your own desired level of saving. Future Value of an Annuity Payment per Period $1,500 Number of Periods 5 Interest Rate per Period 3.0% FV = FV(R, N, PMT, (PV), beginning=1, end=0) Future Value $7,964 3. Assume that you want to deposit savings that will be worth $10,000 in 5 years, so insert 10000 as the Future Amount and 5 as the Number of Periods in the following table. Assume an annual interest rate of 3.00% (insert 3 for Interest Rate per Period). The following table will determine the Present Value, which represents the amount of savings you need today that would accumulate to be worth $10,000 in 5 years. If you input the numbers correctly, the Present Value is estimated in the table to be $8,606. Now revise the input to reflect your own desired savings amount in 5 years so that you can estimate how much you need now to achieve your savings goal in 5 years. Present Value of a Future Amount Future Amount $20,000 Number of Periods 5 Interest Rate per Period 3.0% PV = FV / (1+R)^N Present Value $17,252 4. Assume that you want to deposit savings at the end of each of the next 5 years so that you will have $10,000 in 5 years. So insert 10000 as the Future Amount and 5 for Number of Periods. Assume an annual interest rate of 3.00% (insert 3 for Interest Rate per Period). The following table will determine the Annual Payment, which represents the annual payments that will accumulate to your future desired investment. If you input the numbers correctly, your Annual Payment is computed to be $1,884. Now revise the input to reflect your own desired savings amount in 5 years so that you can estimate how much you need to save per year to achieve your savings goal in 5 years. Compute Payment Needed to Achieve Future Amount Future Amount $20,000.00 Number of Periods 5.00 Interest Rate per Period 3.00% PMT = FV / [FV(R, N, -1)] Annual Payment $3,767

Decisions 1. Using the above formulas and understanding of the impact of interest rates and time on your savings, report on how much you must save per year and the return you must earn to meet your savings goal for graduation, and your savings goal in your first three years of post-graduation life.

I need a report on how much to save per year and the return to earn to meet savings goal for graduation, and savings goal in the first three years of post graduation. Can you please use the numbers above that are already calculated in the formula. I have had an answer on this below. I don't understand why the periods don't stay the same for 5 years. The annuity is 7964 I took that divided b y 60 = 132.7 per month and multiplied it by 12 for a year and got 1592.4. Is that the savings for the answer to saving for a year. IF not I need help figuring out the calculation for the return to meet after gradutaion and the next three years post graduation.

Goal 1	Savings Goal for graduation, FV	$ 20,000

	Time till graduation (Number of periods)	5

	Present value of savings	$ -

	Expected interest rates	3%

	Savings needed per year, PMT	$3,767.09	=PMT(3%,5,0,20000,)

Goal 2	Savings Goal for 1st year of post graduation, FV	$ 15,000

	Time till post graduation year 1 (Number of periods)	6

	Present value of savings	$ -

	Expected interest rates	3%

	Savings needed per year, PMT	$2,318.96	=PMT(3%,6,0,15000,)

Goal 3	Savings Goal for 2nd year of post graduation, FV	$ 15,300

	Time till post graduation year 1 (Number of periods)	7

	Present value of savings	$ -

	Expected interest rates	3%

	Savings needed per year, PMT	$1,996.75	=PMT(3%,7,0,15300,)

Goal 4	Savings Goal for 3rd year of post graduation, FV	$ 15,606

	Time till post graduation year 1 (Number of periods)	8

	Present value of savings	$ -

	Expected interest rates	3%

	Savings needed per year, PMT	$1,754.99	=PMT(3%,8,0,15606,)

A grandmother is looking for a plan to finance her new grandchildâscollege education. She has $25,000 to invest. Search the internetand locate a long-range investment plan, CD, Savings Bond, etc, forthe grandmother. The plan is to earn compound interest.

Calculate the future value of the investment. You must use theadvertised interest rate, the number of compounding periods peryear, and the time the funds will be invested. If you are not giventhe number of compounding periods a year, make it up.

â¢The principal is $25,000. This is p.
â¢Research the annual interest rate for your investment. This isr.
â¢State the time in years for the investment (as in when the newgrandchild will be attending college). This is t.
â¢State the number of compounding periods per year. This is n.
â¢Model the future value of Grandmaâs investment as an exponentialfunction, with time as the independent variable:
?F(t) = P(1 + r/n) nt
â¢State the future value of Grandmaâs investment

ACST101 Lecture Notes - Lecture 2: Interest, Cash Flow, Investment

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