原帖由 prozzy 於 2007-5-18 23:05 發表。 
+ N+ M0 b1 a5 S: H% H% kthe answer is -$97 for sure. 公仔箱論壇. g8 n! \: }) `2 F* S& k" l5 n+ S% S
Think about it this way / d7 D9 M3 z; ^, \ W
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
+ ?3 h& R; m6 y* ?公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 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。- l9 S/ x) ]3 L4 p: C I8 p
公仔箱論壇% v" R) F s' u- E1 D" z( Q0 T
( K% B- A8 U0 O! Q1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
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+ A. G% q- ?+ A5 I: e4 `; R1 f9 J% x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.& s3 m6 x9 ^; \5 s5 \/ F
5.39.217.76" z K( t8 y* k
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |