导读：求大神解一道gre数学题There was a $25 discount on every purchase of $7 求大神解一道gre数学题There was a $25 discount on every purchase of $75there was a 10% charge on shipping which was added before the discou...
求大神解一道gre数学题There was a $25 discount on every purchase of $7
求大神解一道gre数学题
There was a $25 discount on every purchase of $75there was a 10% charge on shipping which was added before the discount and 20% sales tax after the discount was added. If john paid total $300, whatwas the original amount of purchase if no sales tax was added per $75
答案是240. 求怎么算出来的？万谢
lgwdd
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fzmicro01
花朵
该名网友总共回答了24个问题，此问答他的回答如下：采纳率：83.3%
the tax is 5% after discount.
7 Q, f( Q* [- |( S- uso it is 300*0.1+(300-300/75*25)*1.05=240
100*75% = 75，25discount' M+ I. a( t4 f, p7 y7 k; X* i
$100*75%(discount) *1.2(sales tax) + 100*0.1(shipping fee) = 100
2 E. @5 D$ R+ ~1 Z2 e* l所以300*80% = 240
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