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the answer is -$97 for sure. 1 ^1 ^! E  k0 i4 O
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。' b2 B: Q% o& `) ]7 ]: ^. g, e* W2 ~# P
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
4 t( C& P" I* n6 O! G* z" X( stvb now,tvbnow,bttvb2) 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