the answer is -$97 for sure. 7 J) x, H0 x6 q* \; c. m. L& a+ 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。. i( c* w, U# u" w( T# m
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
( F# l. {/ i* w1 ytvb now,tvbnow,bttvb2) 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 |