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OpenStudy (anonymous):
@countonme123 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 7.8 years ago C. About 3.9 years ago D. About 4.6 years ago
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OpenStudy (anonymous):
tell me what you got you should have the hang of this by now
OpenStudy (anonymous):
72/7.8?
OpenStudy (anonymous):
yes
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