原帖由 prozzy 於 2007-5-18 23:05 發表。 
# _5 x* e5 u2 {- O O; ]5 ~; pTVBNOW 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。the answer is -$97 for sure. " L9 { J G Z6 o+ Z
Think about it this way
% @ F8 f# @$ P1 ?: T1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)+ f& }) m: R: @& S0 j
2) Now, the owner discovered that the 100 bucks is fake. You can th ... ) C4 u* Q! G6 O3 ~) S# B% t& B) s, {, m$ h: V+ c( I
: F" I N: h) W* ^1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
& t2 z8 \$ E! _% s [) WTVBNOW 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。
9 A2 y7 J( _/ Z2 j2 |7 B* L公仔箱論壇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.
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+ E5 @# U, O4 [2 m: eI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |