How to find the amount taking into account the commission, so that later you get the amount without commission?

Question

Mathematics

Hello. I want to connect a payment system to the site. There is no item in the settings who pays the commission. I want to add a commission to the final cost.
Commission: 2%
If, for example, for payment without commission: 1000 rubles, then what will be the commission with + 2%.
1000 + 2% = 1020 is not good, because the system will subtract 2% from 1020 and in the end it will turn out: 999.6 and it should turn out exactly 1000

Answer 1

1000/98*100