原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76- W$ z; } g+ h
the answer is -$97 for sure.
0 R% B1 E0 d/ }5 j2 VTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。Think about it this way tvb now,tvbnow,bttvb% f# M; l! A3 \1 S7 G2 q$ D
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.762 F4 m- z1 \' o+ D* @
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 9 R( s7 `0 }1 p3 k
0 m! Y; ~8 b4 Vtvb now,tvbnow,bttvb
7 s; s& v; }0 jtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
$ X. ~3 q4 b& s- I$ zTVBNOW 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。 & b) Q7 A7 l& N) U
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.) B& s7 L( f% O. P g
* V( ]7 R# B( \3 bI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |