the answer is -$97 for sure. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。/ T b$ p! z2 F6 E9 L
Think about it this way 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。9 [5 V" L1 B: E5 x: Y. Y+ q
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)公仔箱論壇( h: I7 @' J" a) d
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 |