the answer is -$97 for sure. tvb now,tvbnow,bttvb7 Z6 u, }* Y% p, F
Think about it this way 公仔箱論壇. v1 W6 n0 I+ ] l! }( ^' j
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
+ [9 z- B3 u& t& j2 ^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 |