2. 外语
  3. A certain money market account that had a balance of $48,000 during all of last month earned $ 360 in interest for the month. At

A certain money market account that had a balance of $48,000 during all of last month earned $ 360 in interest for the month. At

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问题 A certain money market account that had a balance of $48,000 during all of last month earned $ 360 in interest for the month. At what simple annual interest rate did the account earn interest last month?
选项 A、7%.
B、7.5%.
C、8%.
D、8.5%.
E、9%.
答案E
解析 某一账目在最后整整一个月的时间里有余款(balance)48000美元，且该账目在这个月获得360美元的利息，问其最后一个月以多少年单利率获得利息?
解：本题的正确答案是(E)。该题指48000美元的余款在最后整整一月中不变，并获得360美元利息，这360美元一定不包含于48000美元中，因为利息当然是这个月结束后挣得的，并且题目中已提及simple annual interest，即本题以单利计利，利息不参予计利。则年利率为：360/48000 × 12=9%
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