原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76& h* h% I0 u; ?' S3 J. x' |
the answer is -$97 for sure.
4 x9 J4 H1 a! Q% Q# ^公仔箱論壇Think about it this way
& f2 v' d! ?7 X6 l( J mTVBNOW 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)7 w( o" F/ u* V; W2 [3 Z
2) Now, the owner discovered that the 100 bucks is fake. You can th ... + l( H! O* A5 M- }0 B; w. C' D: Y公仔箱論壇5.39.217.768 j9 r4 {4 m1 y; k) w. Z
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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
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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.
0 z/ G5 f* X1 f6 L, H; @9 K5.39.217.76 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。' K1 z5 |& I; _6 W
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |