原帖由 prozzy 於 2007-5-18 23:05 發表。 2 b Y* r( S- B {! \2 j4 ~
the answer is -$97 for sure.
) e+ G! ]! C5 F6 g# h/ kThink about it this way
& B1 l, d8 d8 E% m9 S: ?+ t1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
+ V. P; m! c; m2) Now, the owner discovered that the 100 bucks is fake. You can th ... 5.39.217.76, h1 A/ n Z+ V3 Y; q
公仔箱論壇% [6 [5 f$ Y/ |
5.39.217.76+ F2 m% f# j' A
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
" _2 \. ?$ C2 q3 ]' C$ v, V
* v% h, Q2 j( P$ T. `. s. ~& e9 eTVBNOW 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, 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.# I) d4 z. p& c* X& Y8 p: a
0 a6 G7 [/ _6 l& ? J9 Q# W6 e% TI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |