the answer is -$97 for sure.
) e7 ]: F$ j* F; i: i' B( Z7 ntvb now,tvbnow,bttvbThink about it this way 公仔箱論壇7 ^8 ?. G8 ?% E& F& A
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
: [' ?+ h+ Q. Z公仔箱論壇2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |