Suppose you deposit $2,000 into an account earning an interest rate of 10% per year. Apply the rule of 72, you will have $4,000 after（ ）.
A、21.6 years
B、14.4 years
C、10 years
D、7.2 years
发布时间：2025-10-14 01:39:29
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答案：7.2 years
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