prozzy

the answer is -$97 for sure. % ?( A# T; J* i* c
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。) v; Y  h1 m- x. g/ h2 U7 u# ~1 D
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)tvb now,tvbnow,bttvb, u5 F/ z: a/ z$ s% 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