When one is creating a Dutch book, some programs show a percentage the book is at as one adds more runners .
E.g. if the book is at 50% one will make a profit on the difference once deducted from 100% , in this case =50% approx profit
If the book percentage is say 90% -100%=+10% profit on the result , this is based on actual prices.

If the book is greater than 100% , no profit will be attained based on actual prices.

Cheers.

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Cheers.