Posted by C.J. on Saturday, June 6, 2009 at 7:44pm.
I dont think I am right, but $83.33 or 32.13 I am b=not sure
Let r=interest rate
385.63*(1+r)12=1000
(1+r)12 = 1000/385.63 = 2.5932
Solve for 1+r and calculate r as the interest rate.
Quick check:
Rule of 72 says that money invested at r% will double in 72/r years (approximately).
Since the investment has more than doubled in 12 years, the interest rate should be more than 72/12=6%.
In fact, it is over 8%.
Post your results if you want to check.
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