求助一道数学···

saiko13 · 发表于 2010-10-11 13:22:00

6。for a certain car repair, the total charge consisted of a charge for parts, a charge for labor, and a 6% sales tax on both the charge for parts and the charge for labor. if the charge for parts, excluding sales tax, was $50.00. what was the total charge for the repair?
(1) the sales tax on the charge for labor was $9.6
(2) the total sales tax was $12.6

D 不明白怎么算出来的？感谢各位大侠看看···

jake1 · 发表于 2010-10-11 14:56:51

条件一可以算出labor charge, 9.6/6%, parts charge已知，总charge当然就算出了
条件二可以先从已知parts charge算出其tax，这样加上条件二算出labor charge tax，然后就和条件一推导一样了

starchang14 · 发表于 2010-10-11 15:03:16

楼上思路是对滴,鼓掌!

saiko13 · 发表于 2010-10-12 16:53:21

非常感谢你的回答···谢谢····

求助一道数学···

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