原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇/ \! T6 X3 }7 o3 r2 z+ s$ C# s
the answer is -$97 for sure. 5.39.217.760 S0 _ v; P, {: a( C8 `
Think about it this way ! q$ Z" ~+ c0 s4 f @2 |) B0 }
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇9 y; Q% [0 i- L A) A8 \; C
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 6 r; ~2 K2 V5 p" k4 K/ L( |$ ]" ]# ?/ Y* S) U3 l% M3 L' e9 v
tvb now,tvbnow,bttvb2 t9 A4 E% Y* G( o4 A5 ]' K
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
! b9 f7 r& R! n5.39.217.76 TVBNOW 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。 u* Z1 s7 A9 v& k0 L# e
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.5.39.217.76" F- N" n, ]% }; T
4 H; u" s, i: s8 I RI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |