继续请教PREP题...

slfxiaobai

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 loss of $8
B: neither a profit nor a loss

Key是A，我选的是B，为什么呢？

slfxiaobai

Um...自个顶下，Many thanks in advance.

justeva

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 loss of $8
B: neither a profit nor a loss

Key是A，我选的是B，为什么呢？

-- by 会员 slfxiaobai (2012/5/17 0:57:43)

两股，各96卖出。第一股盈利20%，设A成本为X，x*1.2=96算出x=80，第二股亏了20%，设B成本为Y，Y*0.8=96算出Y=120
也就是两股总成本为80+120=200
而卖出总价为96*2=192
所以亏了8