As a rough guide to double any amount compounded annually, divide 70 by the interest rate. In this case that is 14 years.
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Nine years at 8%
There is what's called the "rule of 72" which states, you divide the percent into 72 and that tells you how log it takes to double your money. For example, 4.6 goes into 72 15.65 times. So, it would take 15.65 years to double your money. That's not too good of an investment. 72 ÷ 4.6 = 15.65
8 years.
11 years
It will take 20 years.