原帖由 prozzy 於 2007-5-18 23:05 發表。  5.39.217.768 y' @" ^ M3 F
the answer is -$97 for sure. : ]7 h5 z X1 c- [7 C; c4 k
Think about it this way
/ U5 q2 V8 E" t# m6 e# W8 j5.39.217.761) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)3 `" h' {: @9 Z$ y, P) c
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
2 M. @- d/ T4 d6 lTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb* j4 A! R( B: R
/ Y q, \/ b/ c' f2 X4 z8 k; U5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill." {3 M2 Z; k9 U' C1 \1 t% h
公仔箱論壇% w" O, t# ]6 G9 i7 [
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |
發表於 2007-7-10 05:18 PM
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發表於 2007-7-11 03:19 PM
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