原帖由 prozzy 於 2007-5-18 23:05 發表。 
1 D7 E. M d: w; N) ithe 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。/ z8 b. n8 i! U/ v
Think about it this way 5.39.217.76* v" m. ~) I5 W/ X8 c0 X+ X; b
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) @9 [2 Q/ }6 s1 D6 _; V) J* b( b公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can th ... 4 t; _3 I' k7 s; H! h
& {5 S1 L$ u' q' }公仔箱論壇 0 O; ?7 u# O: P) E
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrongtvb now,tvbnow,bttvb% y/ y/ g# N5 X7 T4 T6 ]" d
7 z1 v* c' f. r0 Q8 X8 Sthink 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.) }- p |6 x* \ m
# s& C9 |1 y& f/ C1 E5 z3 _公仔箱論壇I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |