原帖由 prozzy 於 2007-5-18 23:05 發表。 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。$ |& I K3 @! Z D# g; L. W, h. r
the answer is -$97 for sure. + j9 L: Y5 e* p& E P6 @
Think about it this way 5.39.217.773 X1 m' U, r7 S8 h/ W) n: j
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
, }) h) T6 c! Q+ h' H* a5.39.217.772) Now, the owner discovered that the 100 bucks is fake. You can th ... * M* C/ B# u$ c& w公仔箱論壇tvb now,tvbnow,bttvb% c e' X( u; X/ Z
5.39.217.77# ?8 v5 V0 j F$ U
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
\+ C; W4 R( Q1 }公仔箱論壇 5.39.217.77+ W& `5 c, `- v! C0 Q8 V
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.公仔箱論壇! n- u1 G+ H) g ~7 w
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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. |