原帖由 prozzy 於 2007-5-18 23:05 發表。 
! L9 c( P& g' u* s q8 n- l6 STVBNOW 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。the answer is -$97 for sure. 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。& Z y- q6 Z+ _1 R
Think about it this way
5 P" r0 N' o0 W% A, R1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇% ]+ `" N" J5 A4 J
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 公仔箱論壇3 z4 W1 I& J' y! p, [1 m
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" ]. a3 T4 S# e. t1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
* Y2 h# t) h/ F5.39.217.76 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。- H# d* e7 S9 U7 [+ `% k
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' O, o6 {. L8 ?* F* @
9 b! |3 B% {* p! s, x4 wI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |