Position size advice for first time investor

The Bear said:

Hi Tech,
Yep you're correct had a more involved looked and it doesn't actually explain how to position size with leverage.
More just some general info on CFD's and Leverage.
Although I'm only new to this game and yet to trade, let alone try CFDs from In the Red example about using Fixed Fractional Positioning he worked out we could buy 10,000 share @ $1.00 = $10,000 worth of shares.
My understanding (correct me if I'm wrong) is if I was using a 10% margin and a $20 brokerage fee, my total
amount of shares to be purchased to allow for this 10% margin would be.
[(Buy Price $1.00 * Number of shares purchased 10,000) * (100% - 10%)] + Brokerage $20 = $9,020

If the margin was 90% then it would be:

[(Buy Price $1.00 * Number of shares purchased 10,000) * (100% - 90%)] + Brokerage $20 = $1,020

That's my guess anyway :/

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