[quote="shena"]Exclusive of tax,was the total revenue from the sale of book X last week greater than $100
(1)Last week more than 9 copies of book X were sold.
(2)Last week the revenue from the sale of each copy of book X was $10.5 plas tax
Ans:(C)
我覺得應該是E啊
題目問除稅的收益
但條件(2)給的含稅的收益 又沒告知稅率
請大大為我解惑...感激

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這題是在考大家閱讀的細心程度,題目給你exclusive,條件給你plus tax,
讓你一直在稅率上鑽牛角尖,其實本題跟稅率完全無關.
條件二的語意為"去年此書之含税利潤為每本10.5",換句話說,已經含税了,都已經有單價10.5的收益了,
再從條件一得知,此書賣超過9本,那取最小值10吧,綜合一二兩條件,
得出10 x 10.5 = 105
超過100,故為C.