the answer is -$97 for sure. 公仔箱論壇4 |! t X A3 d* F* A! D
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。( i" o) R: E( [" K
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)4 R* I2 k( }) E
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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