Question 986183
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If the rate of interest expressed as a decimal is *[tex \Large r] and the number of compounding periods per year is *[tex \Large n] then the amount required to invest as a single payment at the beginning of the four year period is:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ P\ =\ \frac{8000}{\left(1\ +\ \frac{r}{n}\right)^{4n}}]


Plug in your numbers and do the arithmetic.  


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \