求解··那位牛牛能告诉我错在哪了···

xyqirene

A salesperson received a 6-percent commission on the amount of total sales up to and including $10,000, and an r-percent commission on the amount of total sales over $10,000.If the salesperson received a total commission of $920 on total sales of $14,000, what was the value of r?



A.3.2

B.4.3

C.6.6

D.8.0

E.9.2


答案 D

我觉得这道题很简单··但是就算出来和答案不一样···  急死我了···我算出来是2%

wonderfulwq

10000*0.06+4000*(o.or)=920 算出来 是0.0r=0.08 所以r 为8 丫 那里算不出来丫

xjason

过程：

10000*0.06+（14000-10000）*r=920

LZ看看是不是这样吧，希望能帮到您。