Rebasing of scores to be a more accurate reflection

Question

I want to compare various scores with one another on a fair basis. Let's say I have 4 results:

1. 10/20 (50%)
2. 1/2 (50%)
3. 1/4 (25%)
4. 2/10 (20%)

I need to assign weights of importance to the parameters individually before rebasing it to a unified score out of 100. For example the first two scores result in the same % value. But the first score should have a better final score, as the demoniator indicates better performance in my usecase.

Mathematics is not my speciality and I was wondering what the best way to do this would be?

UPDATE

The parameters above are: (Sales Realized)/(Sales Promised)

In order to make it more fair, I should probably account for the number of calls as a parameter as well. Am I right?