Hi Shaun,
The Lay betting thing can be tricky when one starts getting into it, at first.

This is one way to work out the results.

. Write out the outlay for all races.
. Then write out all the payouts which includes the initial stake .

Example.
Say outlay over 10 races at $10 per race = $100

Payouts on unsuccessful horses $10@3.00, $10@4.00 , $10@2.00=$90

$100 - $90 = $10 profit.

STAKING
Here is a proven method for calculating what one could outlay when lay betting.

$1000 Bank
Say bank is $1000 divide by 1/20th of bank = 100
Divide the 100 by 5/1 = $20 per race
On all selections priced between $1.00-$6.00

For horses prices at $6.10+ , Divide the fractional odds of the horse (e.g. 7/1) into 1/20th of bank e.g. 100 mentioned above.

Example
Horse is $8.00 = 7/1 fractional odds into 100 (1/20th of bank) = O/L $14.28
for this horse.

The reason it is done like this is that it takes into account that shorter priced horses tend to statisticaly win more often than longer priced horses.

The 2/1 shots can hit you twice as many times as a 5/1 shots & it still wont do as much damage as the 5/1 shots because we are betting the same $20 amount on all selections that fall within this price range of $1.00-$6.00

Try & avoid progressional betting when lay betting like the plague, you will be sorry.
If one feels they must increase their bet , then no more than 25% at a time.


Cheers.

__________________
Cheers.