原帖由 prozzy 於 2007-5-18 23:05 發表。 % y' D9 c) [3 y4 ^, x8 ^$ h- G9 F
the answer is -$97 for sure. 0 R4 s u2 i- W0 k3 r4 J" l' u
Think about it this way
% H. k4 ^* m$ w& G! z# n& h1 K btvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
1 \0 \- e* n; X6 N5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... + J, F) G0 Y% d& M( m* X, H$ {
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongTVBNOW 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。/ ? e* f6 H, f0 I7 d1 }
3 K) H- `9 I. {" ^/ b& O5.39.217.76think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.公仔箱論壇$ S$ J1 o' {+ b* w& l6 F
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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. |