Multiply one conversion by another

Hi,

I'm trying to work out what extra orders I could get if the conversion rate was at a higher level. For example, let's say I have a conversion rate of 50% on product 1 and 30% on product 2. If product 2 converted at product 1's rate, how many extra orders could I expect to see? My table is similar to the one below:

The issue I think is because when I'm trying to apply the conversion rate from product 1, it's already filtered to that product so can't apply it to product 2.

Thanks in advance for any help!