假設原本有$10, 用$8買雞, 剩$2
e! }! a# _% Y3 T3 B6 }2 `tvb now,tvbnow,bttvb之後$9賣出, $2+$9 = $11
7 @8 ^5 e8 J2 j5 ?/ Ktvb now,tvbnow,bttvb再用$10買雞, $11-$10 = $1tvb now,tvbnow,bttvb6 t$ R( V# I: c- B. |1 Z
又再以$11賣出, $1+$11 = $12
7 b' z. z( U7 i( G1 `公仔箱論壇$12-$10 = 賺$2 |