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Each quarter, you are going to make Interest rate/number of periods per year on your investment. Since you have an interest rate of 8% and four periods per year, each quarter you make 2% on your principal.

Thus, the formula for determining the value of your investment after ONE quarter is Principal * 102% or P*1.02.

Each time you accrue interest, your investment grows by a further 2%, so the formula for the value of your investment over x quarters is P*(1.02^x) (the carrot "^" is a common computer symbol denoting an exponent).

Since you are interested in 8 years and you have 4 quarters per year, you will have 32 compounding periods and a final formula of P*(1.02^32).

Since you don't know P, but do know the final value of $2000, you must solve the following equation for P.

P*(1.02^32)=2000

To do this, simply divide both sides by 1.02^32. This gives you the value of your initial principal:

P = 2000/(1.02^32)

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Q: How much money needs to be invested now to get 2000 after 4 years at 8 percent compounded quarterly?
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