the answer is -$97 for sure. 公仔箱論壇2 L! v( B! U# v4 R( A
Think about it this way 2 z" u- s3 r5 [, @0 u; A% G7 f3 I- d/ G
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。6 H: u# d) J' n* A
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 |
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