请教一道数学题~GWD6 Q33

girasol0821 · 发表于 2012-7-28 13:28:21

Q33:
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
我想的是4000*r%+14000*6%=920 怎么算都等于2，拜托大牛们看看吧~万分感谢~

jsmart · 发表于 2012-7-28 15:19:04

4000*r%+10000*6%=920
r=8

girasol0821 · 发表于 2012-7-28 15:37:23

谢谢~

请教一道数学题~GWD6 Q33

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