Using the Rule of 72, how many years would it take to double your money if your ROI is 4%?
A. 16 years.
B. 22 years.
C. 14 years.
D. 18 years.
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18 years.
Using the Rule of 72, you divide 72 by the annual ROI percentage. So, 72 / 4 = 18 years.