GRE 猴哥112数学难题,

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GRE 猴哥112数学难题,
GRE 猴哥112数学难题,

GRE 猴哥112数学难题,
楼主说的是这个题?
acertain money market account that had a balance of $48000 during all of last month earned $360 in interest for the month.at what simple annual interst rate did the account earn interest last month?
答案是9%
$48000的月利息是$360,问年利率
360*12/48000 = 9%