原帖由 prozzy 於 2007-5-18 23:05 發表。 
' P! J& @" `) F; G- `( Pthe answer is -$97 for sure.
: t0 c1 e5 H" yThink about it this way 5.39.217.768 n$ h1 w& T% |2 ]' C
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
- J( }2 v* a6 _ G* Z2) Now, the owner discovered that the 100 bucks is fake. You can th ... * g$ ^7 F" Y" Y9 a( w# t% T5.39.217.76
$ [! l) A9 y* P1 ^8 [% T公仔箱論壇
6 T7 @' n c( e& t& g& g1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong4 U* @4 ^" C0 x0 ]- s$ B) P6 r( A
; A# R5 i5 D! [' M5.39.217.76think 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 s9 V' e' a) ^, t. f
+ n B r4 T' K) q1 `; WI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |