the answer is -$97 for sure. 5.39.217.775 {/ P: S* K$ X1 i9 U2 ?
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。6 B1 V3 l! E3 F
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
q; r; l* e& N1 C! E4 D" q1 @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 |