我想問下一d股市問題

買入價$9 一共 33,000 股
Consideration = $9*33,000 = $297,000.00
Brokerage 1% = $297,000*1% = $2,970.00
XACT Levy 0.004% = $297*4% = $11.88
S/Duty 0.005% = $297*5% = $14.85
Total purchase price = $297,000.00+$2,970.00+$11.88+$14.85=$299,996.73 say round to $300,000.00
賣出價$11一共 33,000 股
Selling = $11*33,000 = $363,000.00
Brokerage 1% = $363,000*1% = $3,630.00
XACT Levy 0.004% = $363*4% = $14.52
S/Duty 0.005% = $363*5% = $18.15
Net selling = $363,000.00-$3,630.00-$14.52-$18.15 = $359,337.33
Gain = Selling - Purchase = $359,337.33 - $300,000.00 = $59,337.33

2007-04-26 08:55:31 補充：
你可能俾錯題目，如果$150=2,000股，即是$150*2,000=$300,000 但你又話買既時候係9蚊，噤點夾$150呢。你封實買既時候係$300,000同買既時候係9蚊，又點做到2,000股。你冇俾手續費和證交稅的%，所以只好當香港的徽收率計。還有，你唔使俾佣金嗎？我只是用還原法計出你買了33,000股，假使你有買价和股數，你照程式做個新答案便成。

買入$300000 除 $9 = 33333股
沽出$11 乘 33333股 = $366666
減番你既本金$300000 = $66666
再扣除所有費用 = 純利

2007-04-24 05:47:28 補充：
普通係每手每手咁買,而手數既數量隻隻都唔同.以上係簡單既計算只作參考.