原帖由 prozzy 於 2007-5-18 23:05 發表。 
5 N( @0 D6 J: C/ G( u: ]the answer is -$97 for sure. tvb now,tvbnow,bttvb C( L \7 c, N) `# ]/ J5 ^5 r b
Think about it this way 4 J: H7 i0 m0 `, T
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
7 c+ k3 K- B+ c& r/ FTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2) Now, the owner discovered that the 100 bucks is fake. You can th ... 2 a8 Y# ?9 r9 {7 m* l1 w5 Z公仔箱論壇* k+ a% {# m. h8 d; H' J7 S
" ]8 t# l; M m2 b1 z1 C6 R公仔箱論壇1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
! t$ I0 J# ]4 H1 Ktvb now,tvbnow,bttvb 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。! w& a7 W/ o% S% d) c9 }. S9 |
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.公仔箱論壇! U( g" |) A) t. v$ u
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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. |