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Jon has $5,000 to invest in a savings account that has interest compounded annually. If he wants his money to double in eight years, what percent must the interest rate be on the account?

 Jan 26, 2017
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He will be looking at this scenario

10,000 = 5000 (1+i)^8

10000/5000 = (1+i)^8

2 = (1+i)^8    take the 8th root of both sides

1.0905 = 1 + i

.0905 = i     or   9.05 % annual compounded annually

 Jan 26, 2017
edited by ElectricPavlov  Jan 26, 2017

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