the answer is -$97 for sure. tvb now,tvbnow,bttvb$ s0 v6 M6 V1 Z! B- ]* r
Think about it this way
, Y& z* {; ~& B# m3 L& ~, ~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)os.tvboxnow.com* c1 o2 b- I- d0 F8 H
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 |