JATER

假設原本有$10, 用$8買雞, 剩$2os.tvboxnow.com! D8 Q5 O6 a- E9 _2 _
之後$9賣出, $2+$9 = $11
6 n8 ~8 m" k9 I* U2 ~- p' wtvb now,tvbnow,bttvb再用$10買雞, $11-$10 = $1
9 K. Q. ~: k. b* Y$ ~又再以$11賣出, $1+$11 = $12& k: v2 q" b& ^) p& p2 n
$12-$10 = 賺$2