原帖由 prozzy 於 2007-5-18 23:05 發表。 
( v; N( Q, L8 o+ btvb now,tvbnow,bttvbthe answer is -$97 for sure.
7 P! H: y2 C, g$ x9 R: W5.39.217.76Think about it this way
: A- U: B! F9 F7 Q% B* BTVBNOW 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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
. \# f+ M V! O; B/ I4 `* qtvb now,tvbnow,bttvb2) Now, the owner discovered that the 100 bucks is fake. You can th ... TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。: d/ d: `9 I* O7 Q% c7 s5 o
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; D. y8 K$ G# q! Ltvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
3 T+ `) c3 l3 e% s3 q. gTVBNOW 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。 . i6 X" V% Z: ]7 n2 d R9 N& p2 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.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。4 j- s3 Q! K1 L3 h/ B9 x
4 v9 ~2 |( E2 j/ l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. |