有关求百分比,英语题目

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有关求百分比,英语题目
The administration fee for the American Mathematics competition was US4.00dollars for each student. The organiser collected S5.00dollars from each student.If the exchange rate was S1.00dollar=US1.32dollars,calculate the percentage of the amount of money earned or lost by the organiser. 请详细告诉我解法!

Because S5.00=US5*1.32=US6.6
So earn each student = US6.6-US4 = US2.6
percentage earned = 2.6/4*100%=65%

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