1.76 lay is equal to 2.316 back. With 2.0% commission is 2.289

1.72 lay is equal to 2.389 back. With 6.5% commission is 2.299.

back = 1+1/(lay-1)

adjust after commission: 1+(back-1)*(1-comm)

Thanks. I will be using this. But is there a way to calculate at which moment the lay bet odds are the same as lay bet on the other exchange?