P2-DS-68

[sunnyblue13s]

68. 5640-!-item-!-187;#058&004354

In 1999 Company X's gross profit was what percent of its revenue?

(1) In 1999 Company X’s gross profit was 1/3 of its expenses.
(2) In 1999 Company X’s expenses were 3/4 of its revenue

(D)

我是智商降低了還是昏頭了.....這題我怎麼想都想不到(D)

求P=?R

(1)P=1/3E
(2)E=3/4R

應該是(C)吧~~P=1/3E=1/3(3/4R)=1/4R

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In 1999 Company X's gross profit was what percent of its revenue?

(1) In 1999 Company X's gross profit was 1/3 of its expenses.
(2) In 1999 Company X's expenses were 3/4 of its revenue

(1) E = 3P代入Profit = Revenue -Expense得P=R-3P，題只問P佔R的%，所以只要知道PR的比例關係應可推算出。

(2) E=3/4R 代入Profit = Revenue -Expense，理由同上。

這一題考的陷阱是三個未知數，一般都會覺得要三條方程式才可解，但是有時候題目只要求出比例關係即可。

如有錯誤，請指正

[sunnyblue13s]

謝謝囉~~我昏頭了~~