原帖由 prozzy 於 2007-5-18 23:05 發表。 
& M/ ~; Z. v) x* M6 o5.39.217.76the answer is -$97 for sure.
9 w" c/ v; k/ _, P! rThink about it this way 公仔箱論壇" Q) H: Z1 Q2 p; @* k7 V
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! _3 H% V/ B! }! R3 M公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... # \0 T$ p( z) P公仔箱論壇5.39.217.76 b+ q; }3 V- V- _# s
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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 wrong
@ E* B* y# @9 p公仔箱論壇
& g( T+ z3 I" X; Y& A, _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.tvb now,tvbnow,bttvb/ x3 H. `1 j) ~
q8 n9 M* f9 O- n6 u5.39.217.76I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |