33:390:300 Chapter Notes - Chapter 5: Spreadsheet, Interest, Investment

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24 Jan 2017
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Time value of money: dollar today worth more than dollar promised in future: you could earn interest while you wait so dollar today would grow to be more than . Investing for single period: if you invest one period at a time at interest rate r, your investment will grow to (1+r) per dollar invested. Investing greater than one period: compounding: reinvesting interest accumulated, with si(cid:373)ple i(cid:374)terest, i(cid:374)terest is(cid:374)"t rei(cid:374)vested, only earned on original principle. Future value = principal * (1 + r)^t. Present value: the current value of future cash flows discounted at appropriate discount rate. Pv = 1000/(1. 07)^2 = 873. 44: pv of = pv = 1 * (1/(1+r)^t) As length of time until payment grows, present value decreases. Present value versus future value: pv * (1+r)^t = fv, pv = fv/(1+r)^t = fv * (1/(1+r)^t) When given everything except interest rate in present value problems, use (fv/pv)^(1/t) 1 to solve for the interest rate.

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