the answer is -$97 for sure. tvb now,tvbnow,bttvb0 f. f# `, t( \) K! z7 x
Think about it this way
- G. S6 V' t$ J" _6 F7 F' ~: TTVBNOW 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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)6 `: y8 l9 [: G1 M+ F* ~/ H, M, N
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 |