原帖由 prozzy 於 2007-5-18 23:05 發表。 tvb now,tvbnow,bttvb7 h/ G' s6 W, ]6 v2 z! l. _
the answer is -$97 for sure.
4 p1 l% i* v: h& C' w' N( ZThink about it this way 公仔箱論壇: i6 |1 E' x. ~0 }( ?. G5 {
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。! |0 K/ x* _ A! x9 o( P
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ) T- v7 i$ _4 g ]- S: g0 t' h- V
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* f; Z9 m; ^# p$ h9 oTVBNOW 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 wrong
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think 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.
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |