原帖由 prozzy 於 2007-5-18 23:05 發表。 - m3 P0 K3 I' D+ x+ k& M
the answer is -$97 for sure.
, `' e1 V. |* W: l0 c! P/ a4 `tvb now,tvbnow,bttvbThink about it this way . H3 z* Y i; |, i2 D9 j/ n- t
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)' r- i0 M9 I7 A4 D) B
2) Now, the owner discovered that the 100 bucks is fake. You can th ... : m e U8 Z" Q o
公仔箱論壇9 D1 A6 A% w' P
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1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong
7 e+ i. h, f" M) x6 @tvb now,tvbnow,bttvb
) F+ e$ Q F) p* n& \+ Rthink 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.tvb now,tvbnow,bttvb) L7 U; t1 p" ]; A7 a8 K& G4 s
/ V' @8 Y% v* i; X9 QI know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |