Saturday
November 22, 2014

Homework Help: Algebra

Posted by A.J. on Sunday, November 29, 2009 at 9:16pm.

Jason and Mary have a new baby. They want to invest $20,000 at the baby’s birth in order to have $100,000 for the baby’s college education. What interest rate do they need to earn in order to achieve this in 18 years?

Use the following formula to determine the average interest rate:
r = (S/P)^1/n – 1

where S = the final amount
P = the initial investment
n = number of years

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