原帖由 prozzy 於 2007-5-18 23:05 發表。 6 H' W; R! ^; F C6 b6 Z6 H
the answer is -$97 for sure.
# T9 k6 P" k- l9 J' h7 m0 vThink about it this way
) J* ?0 O% s1 X$ M6 X$ {! |- N$ ~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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
5 i* S: P2 [ C6 {3 Y3 r9 v2 z* w公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。+ `, o. o. y. Y/ [% Q+ E
www2.tvboxnow.com' L2 z9 E0 l8 b
0 T% @" ], ~3 W8 K1 y1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong0 W$ V# q- ?, [6 S4 k9 @ X
- c! a5 D6 H* c. T" E! Z3 c7 zthink 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.' e( L B) F- d1 B
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I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |