原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇/ x( ?, \' f8 p# e0 D. H/ ?2 N
the answer is -$97 for sure. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2 y9 P9 c3 @3 X. h9 ~% F/ B
Think about it this way
+ w$ \0 R( Z" R! g; y1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
1 Z1 U. E! _- {9 o2) Now, the owner discovered that the 100 bucks is fake. You can th ... , O3 H( ~$ X6 I) f! B- ~0 `' n' R, o F9 a- U! U
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
" E" `& y% j8 }7 ytvb now,tvbnow,bttvb * B: t2 j* l" |& k' f
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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' s9 ]1 q8 G- A" d- T) ftvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |