假設原本有$10, 用$8買雞, 剩$2tvb now,tvbnow,bttvb8 k& |5 T) v9 F5 V! |2 x9 c
之後$9賣出, $2+$9 = $11
5 T/ c6 w1 e# f7 a/ y" c; D9 M再用$10買雞, $11-$10 = $1www3.tvboxnow.com( l9 J! \+ ^5 P& ^6 I; f& J" u- s
又再以$11賣出, $1+$11 = $12tvb now,tvbnow,bttvb5 |/ O; G, E [
$12-$10 = 賺$2 |