原帖由 prozzy 於 2007-5-18 23:05 發表。 
/ h% I9 p/ `& R9 O/ u/ V公仔箱論壇the answer is -$97 for sure.
. u a( i i) M/ _- Rtvb now,tvbnow,bttvbThink about it this way 5.39.217.76' v/ I( Y( o0 d5 Y# J1 y
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇8 Q- M* z% e: z# {/ v; J. a% P
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.764 D; R8 T6 p6 C- d U, q
+ [1 h; G" ]' G' F5 A$ Xtvb now,tvbnow,bttvb 公仔箱論壇* x& t# D; u3 T+ j& F% D
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong5.39.217.76# x, H0 L, z5 i8 b
# G, s4 [$ h7 s" F3 X) L' W xthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.( Y/ |4 q: [: T4 {$ D
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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. |