the answer is -$97 for sure. tvb now,tvbnow,bttvb R! \, Q7 o d T* l
Think about it this way tvb now,tvbnow,bttvb4 [6 O6 j, G3 Q# P
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( \% E) c8 E1 R# A RTVBNOW 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。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 |