MATH 110 Lecture Notes - Lecture 18: Annual Percentage Yield, Annual Percentage Rate, Effective Interest Rate

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26 Sep 2016
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Math 110 lecture 18 rule of 72; apr vs apy. Gives the time it takes to double the principle. Where r is the whole number of interest rate. Note: if r = 4%, then r = 4, not . 04. Find how many years it takes for the principle to double at 4%. Plug the value for r into the above equation. Therefore, it takes 18 years for the principle to double at 4%. Apr: annual percentage rate (normal interest rate). Will be r, where r is the annual interest rate. Apy: annual percentage yield (effective interest rate): model: c (1 + r) c x t - 1 r = annual interest rate, and t = 1 as annual time (t will always be 1 in this model). As stated above, the apr is represented by the letter r, and since we have the value for r given to us, this means that the apr is simply 4%.

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