原帖由 prozzy 於 2007-5-18 23:05 發表。 
8 J! n. a1 f7 Q8 Z: l: Jthe answer is -$97 for sure.
4 Z' {* j7 w" R% ?1 |tvb now,tvbnow,bttvbThink about it this way
: o- @! s* L' rtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
* A/ b$ d1 i+ g5.39.217.762) Now, the owner discovered that the 100 bucks is fake. You can th ... tvb now,tvbnow,bttvb8 C4 t' E; l( T$ J# r# i9 [
& L7 m4 _8 z# J1 w" s公仔箱論壇
3 V, t. m t( M# I% V0 e公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong- z* E* e, a. O
9 W/ K1 w$ |3 D" I# Q8 jtvb now,tvbnow,bttvbthink about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
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$ e" ^ d9 w7 X7 t* `公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |