Rule of 72 Approximately what interest rate is needed to double an investment over six years?
A)6 percent
B)12 percent
C)17 percent
D)100 percent

Name: Rule of 72 Approximately what interest rate is needed to double an investment over six years? A)6 percent B)12 percent C)17 percent D)100 percent
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The doubling time (years) for an investment is calculated by dividing 72 by the interest rate. Thus, for an investment to double in 6 years, the interest rate needed is approximately 12 percent (72/6=12).

Rule of 72 Approximately What Interest Rate Is Needed to Double