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the answer is -$97 for sure. 5.39.217.775 C! k8 u! `: v8 N
Think about it this way
- p4 O% G- d. z5 _, kTVBNOW 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-$18)
) ~8 ?+ ~8 Q4 ]' i$ m% y) G5.39.217.772) 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