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4 January, 13:19

Mack opened a cd 10 years ago at an interest rate of 7.8%, compounded monthly. According to the rule of 72, when did he have half the amount of money that he has now?

A. about 9.2 years ago

B. about 4.6 years ago

C. about 3.9 years ago

D. about 7.8 years ago

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Answers (1)
  1. 4 January, 15:42
    0
    72 rule says

    72/rate=Time

    72/7.8 = 9.23 years
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