原帖由 prozzy 於 2007-5-18 23:05 發表。 5.39.217.76" `& l/ J/ m" B# t
the answer is -$97 for sure. tvb now,tvbnow,bttvb/ H, m \1 C4 A7 C
Think about it this way
+ ?( n4 y2 M" T6 C* Y" v/ S6 g公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)6 f0 c* p6 R3 h! f2 k. n# T+ H# a
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : ]' E/ M* T3 r& k# w3 n4 O5 ?tvb now,tvbnow,bttvbTVBNOW 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。5 q3 Q& L1 t+ _! o5 f7 e
tvb now,tvbnow,bttvb; }" F4 _9 G) S9 C
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
( i" u& w, h1 v, z- h) g5.39.217.76 * t- I2 U/ {4 W# g
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.3 l* c9 W; z5 X% X
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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. |