the answer is -$97 for sure. + a8 } `0 Z" \$ @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。Think about it this way 0 Y% A* W. F2 k+ k+ a1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18) 3 q! ^% T* z$ E+ A6 I6 w- s2) 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 = -$97
i think it's 77TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。! y$ Q8 Y4 n4 t1 A8 o% Q* G
tvb now,tvbnow,bttvb0 c U, [6 S, W4 g. W$ V( {$ F
[ 本帖最後由 tat_tat0210 於 2007-5-21 03:48 AM 編輯 ]