the answer is -$97 for sure. tvb now,tvbnow,bttvb: W3 f5 Z# w4 I, d' F: z) \: p
Think about it this way
: o4 M4 v0 h5 ]9 H+ U; I/ _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。1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)6 A4 _9 I7 e8 w$ T, d3 j; q
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 |