prep 2 154

Kath1985

154.15633-!-item-!-187;#058&010772

Bobby bought two shares of stock, which he sold for $96 each.If he had a profit of 20 percent on the sale of one of the shares but a loss of 20 percent on the sale of the other share, then on the sale of both shares combined Bobby had



(A) a profit of $10

(B) a profit of $8

(C) a loss of $8

(D) a loss of $10

(E) neither a profit nor a loss

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【答案】C

根據題意 我設: 售價-成本=獲利
股票1  a profit of 20 percent on the sale of one of the shares  96-C1=0.2*96  C1=76.8
股票2  a loss of 20 percent on the sale of the other share 96-C2=0.8*96        C2=76.8
將  兩者售價-兩者合併成本=(196+196)-(76.8+76.8)=賺38.4  可是答案沒有........請問錯在哪呢 ==!!

yvonne880919

股票 1成本c1,股票2成本c2

(96-c1)=0.2*c1    c1= 80

(c2-96)=0.2*c2     c2=120

192-200= -8

dreamhk

请问在哪里下数学 prep 1 2. 我怎么找不到. 谢谢了!!!