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the answer is -$97 for sure.
4 V2 I9 |$ b8 G1 q. `0 z( P7 V5.39.217.77Think about it this way
9 \4 [" s$ t' _7 Z# r: ~9 LTVBNOW 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-$18)
7 @& ?  O1 R$ x1 Y* B$ W& O: {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。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