the answer is -$97 for sure.
+ S1 r8 D( d* x) M3 m% E1 VTVBNOW 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。Think about it this way
$ Q/ K( d f0 o d' ]; M/ Lwww2.tvboxnow.com1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
$ {0 f' U8 {+ P7 Q( g5 R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 |