原帖由 prozzy 於 2007-5-18 23:05 發表。  ; m1 d {& B* C/ G
the answer is -$97 for sure.
2 X! A+ S Z& P8 c% l" mThink about it this way
6 n# x7 w* Q$ I _' ptvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.76$ o- l6 V9 k* k0 g9 [+ t
2) Now, the owner discovered that the 100 bucks is fake. You can th ...
% U+ j7 A/ I! k6 ~8 vtvb now,tvbnow,bttvb1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
" @6 i! B/ V- ]/ l tvb now,tvbnow,bttvb- ?6 T: V) w. a2 h8 m
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.+ {6 @7 b: C; I2 {
7 N" w8 ^% U. `' HI 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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