JATER

假設原本有$10, 用$8買雞, 剩$2
* b" {8 I  v; Z6 k- X% l( h5 ros.tvboxnow.com之後$9賣出, $2+$9 = $11公仔箱論壇6 h  s  e" E4 j/ |, S- Q( Q
再用$10買雞, $11-$10 = $1
% v* Q1 e1 o2 l8 ~+ |, u公仔箱論壇又再以$11賣出, $1+$11 = $12
' l2 Y  m2 I* }7 P/ [* k( g$12-$10 = 賺$2