意思是一个货币市场上个月共结余48000，用它赚了360的利息，问以年单利计算每年利率是多少?。
A certain moneymarket account that had a balance of $48000 during all of last monthearned $360 in interest for the month. at what simple annual interestrate did the account earn interest last month?
只生单利，那意味利息与本金是分开计算的。
It may earn simple interest, whichmeans the interest is figured on your principal alone
计算利息有两种方法： 单利与复利。
There are two ways of calculating interest : simple interest and compound interest .
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