the answer is -$97 for sure. www3.tvboxnow.com1 B1 ?- V3 N' x
Think about it this way
' _+ P5 |4 a7 W; ~* G1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
5 Y) B7 T* s( V2 W& g# O6 ?7 DTVBNOW 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 |