原帖由 prozzy 於 2007-5-18 23:05 發表。 公仔箱論壇' s5 t1 X# q$ a
the answer is -$97 for sure. 公仔箱論壇% k: @) X- o0 d# E& j. V
Think about it this way
. W* P! ]+ {; X: y8 [; [( ptvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)) D9 T( z1 J9 s% @* c* Z) c; a* b
2) Now, the owner discovered that the 100 bucks is fake. You can th ... 8 x- j& F3 E S, o+ o7 J
: g! b5 T2 H% W4 T$ o公仔箱論壇 5.39.217.76+ H+ z& m; ~# l% n X6 X# x0 V
1) very good, it the 100 bucks is real, your answer is correct, but it is fake, so your answer is wrong- j& A2 i/ X! }$ A
公仔箱論壇- ^% R1 j, k3 j
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.! }) v3 H& V% d, W, B
5.39.217.76! m# i5 t+ X% W* a
I know the answer becoz it really happening to my friend in his store in real LIFE, it can not be wrong. |