the answer is -$97 for sure. f% V8 J6 y; I) e1 |3 M& K6 m1 D
Think about it this way 5.39.217.77:8898( r- D0 G% ^4 G/ W8 D
1) 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。: n3 T6 ?5 c4 V% L# I8 [8 S2 p2 e- c
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 |