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
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y = ln(3)/ln(1.0575) = 19.65 years, approx.
10 years. Compound interest would take 7 years.
6.40 because if you can find 25 percent and 5 percent you can take 5 percent from 25 percent for 20 percent.
Nine years at 8%
It depends how much money you have .