假設原本有$10, 用$8買雞, 剩$2公仔箱論壇& u4 l* Q: ?& g5 O. ]
之後$9賣出, $2+$9 = $11
! {8 B0 O% z y$ ^) s; X5.39.217.77:8898再用$10買雞, $11-$10 = $1
" O+ [. \* n* y3 {+ v2 v5.39.217.77:8898又再以$11賣出, $1+$11 = $12
0 D+ P, k% D; j% C; q- I: Utvb now,tvbnow,bttvb$12-$10 = 賺$2 |