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the answer is -$97 for sure. tvb now,tvbnow,bttvb6 }0 f& Q) r8 {& }0 ^4 d
Think about it this way
! D, W' H; K# a. e& R% F" UTVBNOW 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)公仔箱論壇. q# [( v! X; X: N, f% u
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