原帖由 prozzy 於 2007-5-18 23:05 發表。 
& S% h7 t5 d5 F1 a+ `tvb now,tvbnow,bttvbthe answer is -$97 for sure. 公仔箱論壇: I: a5 Z% V0 k% w
Think about it this way
$ V% w' l* _& H/ W0 S, A( qTVBNOW 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)/ @ T* a ~! Q* |; L' g) Y. k
2) Now, the owner discovered that the 100 bucks is fake. You can th ... $ C7 v6 k/ {' R4 Q! s- ~! X1 a N9 v5.39.217.76: h, z, t2 t& I% [3 M' [
) }" R7 X; @/ N) N. s- G2 Q1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong+ u9 k9 V5 \0 G9 z7 y' F( z; a2 H
$ n& t4 r# r. Q7 r5 L" x5.39.217.76think 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.5.39.217.765 T- g4 O' l- Z6 S) X/ Q
公仔箱論壇5 [# k4 ]' a0 G
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |