the answer is -$97 for sure. www2.tvboxnow.com' h5 c' ?) d/ U1 _& D" Z
Think about it this way
/ o6 {8 |6 O6 i7 X% A+ Qtvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)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。7 V2 J; ]5 l% B% c9 \! P4 z
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 |