Posted by **Sierra** on Thursday, November 19, 2009 at 3:43pm.

How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate??

- Math -
**drwls**, Thursday, November 19, 2009 at 4:10pm
If the interest it withdrawn annually and not compounded, the number of years T is given by

1200*0.07*T = 252

T = 252/[(0.07)(1200)] = 3.0 years

If the interest is compounded (lefgt in the account), it will take a bit less time, but the formula to use is quite different.

I believe they expect you to assume interest is withdrawn each year.

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