原帖由 prozzy 於 2007-5-18 23:05 發表。 
; L2 D6 _# g4 n" i K. ~the answer is -$97 for sure.
7 `1 k3 k) o \$ HTVBNOW 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。Think about it this way ( H3 d* O9 E8 F6 U& _' t; }
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb1 g8 c* c* a. ?% ~3 q
2) Now, the owner discovered that the 100 bucks is fake. You can th ... . ]% v+ \1 i' S" \) q! \$ f" O0 |! U5.39.217.763 e7 H/ A; d# ^) W3 e6 e
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。% W' I! l* x, {& s& P) O( b7 F j
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
( Z, i0 B3 G# t1 M0 ]5 |* I6 M5.39.217.76 + v. h0 `0 v7 L) i( I, p
think about it, when the bill is fake, and he gave him $79 change back, that is -79 already, it means the 100 on his hand is equal to 0 (Zero), how did he makes profit when he got a fake bills, then he need to pay another real 100 dollars bill to his neighbor, that another -100, plus the product he lost, thats another 18 dollars, Do Not Even Mention the 3 dollars, there is no profit he can make when he got a fake bill.
; l5 e/ M( ?5 b& J, ?: ktvb now,tvbnow,bttvb
# b; W$ f5 [7 ^1 s/ _tvb now,tvbnow,bttvbI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |