[問題] 問一題數學
雖然每個字都認識，但還是不太了解問題
請高手解答，謝謝。
A certain money market account that had balance of $48000
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?
選項有 A.7% B.7.5% C.8% D.8.5% E.9%
Ans:E 9%
我算的答案是7.5%，不知是哪裡誤解題目了，謝謝。
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