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Old 7th August 2011, 06:52 PM
Shaun Shaun is offline
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Join Date: Jan 1970
Location: Western Australia
Posts: 3,403
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Just do it the way you would for win betting, What ever you payout is your outlay and what ever you win is your return.

For example

If i lay 100 runners @$100 = $10,000 this is my return.
If i paid out in liabilities $8,000 this is my payout.
Results $10,000-$8,000 = Profit $2,000
POT $8,000/$2,000 = 25%
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