原帖由 prozzy 於 2007-5-18 23:05 發表。 
2 `* `# e1 l: \5 Y# |5.39.217.76the answer is -$97 for sure. tvb now,tvbnow,bttvb4 r3 @3 Y3 ^+ p# X
Think about it this way ' r. |& I. t: R* \
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)/ Z! X/ { {& H- X2 c0 x0 V
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76' F/ v; Y+ U) I/ I
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* L8 `' O+ J! E$ Z6 t5.39.217.761) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong# \2 N/ l |# N( p1 l
/ x6 u S8 X6 y0 K% g9 B( c/ t6 h公仔箱論壇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./ s6 k: {8 T7 {- ]) {; }
% G" ^1 N& c/ f+ z; c: Z pI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |