GWD18-35

[yellowten]

Q35:
For a certain car repair, the total charge consisted of a charge for parts, a charge for labor, and a 6 percent 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 $9.60.
(2) The total sales tax was $12.60.


答案D

請問一下喔
為什麼單獨看A可以成立呢?
怎麼算的呢?

[FrankChang]

(1)工資x的稅金是9.6,0.06x=9.6,x=160
連工帶料(50+160)*1.06

[livory]

這題我還是不太懂, 不懂的地方在於 0.06x=9.6這個部分耶
有誰可以幫忙解答!謝謝!

[lucyyeh]

題目已經說"a 6 percent sales tax" on both the charge for parts and {the charge for labor(工資)}.
條件一已知稅金不知工資，設工資x 接下來就是上面那個式子