Excel Formula Needed

I have created a couple of spreadsheets for recording bets. Back, Lay, etc but mainly for level stakes or backing a percentage of a bank.

What I want is ficed liablity laying, and I can't seem to be able to work it out. Saying that, I am pretty hopeless with Excel.

So for exmaple, if I wanted a liability of £10, and H3 is my stake & I3 is the lay odds, what would be the calculation?


Cheers.