帮忙看下这道prep 答案是B

帮忙看下这道prep 答案是B  可我做来作去还是E

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For each of her sales, a saleswoman receives a commission equal to 20 percent of the first $500 of the total amount of the sale, plus 30 percent of the total amount of the sale in excess of $500.  If the total amount of one of her sales was $800, the saleswoman's commission was approximately what percent of the total amount of the sale?

(A) 22%

(B) 24%

(C) 25%

(D) 27%

(E) 28%