I have added the staking size into it.
A stake of 0.10 means 0.1% of the bank.
A stake of 0.50 means 0.5% of the bank.
A stake of 2 means 2% of the bank.
A stake of 5 means 5%, etc.

For example if you have a bank size of $40,000 and you had a 0.10 stake for a lay then you would lay the $40 on the selection. If the selection was $100 then this would be a liability of $40*$100 -$40 = $3960 if the selection goes against you. I hope that makes sense.