the answer is -$97 for sure. 公仔箱論壇" s! ?0 O i- \& g4 z
Think about it this way os.tvboxnow.com8 u4 Q) N, T0 ~4 P/ I' r- S& ^0 a) C
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! O# j5 x4 ]% A# l3 v7 ^, w+ d0 ?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 |