the answer is -$97 for sure. $ I/ e- n* v7 a
Think about it this way
( ?; b( H6 k. x3 y+ F9 K- OTVBNOW 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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb P$ j/ H7 ~0 y4 \! R
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 |