原帖由 prozzy 於 2007-5-18 23:05 發表。 
: J/ [/ b$ b8 ?3 P) `the answer is -$97 for sure. 2 i% g# v4 Z3 F$ {6 J
Think about it this way 5.39.217.769 O& a- r' }* v3 u0 }3 @% z( j
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76( o/ d8 H: }8 \- B3 B" | k
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
+ o5 s+ m+ u5 x8 i0 h) q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 wrong0 ~1 d6 w9 P# b/ G; G E. [! ]; G
' l" N6 L0 d4 C% a2 ?1 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.
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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. |
發表於 2007-7-10 05:18 PM
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發表於 2007-7-11 03:19 PM
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