Reward Risk Measure Percentage Calculation

The current calculation of the works as follows:
“We’ve looked into this and the client who requested this tool wanted it based on the average price of the stop and entry. In your example the Stop is 80 with an Entry of 100. The range is 20, and the average of the stop and entry price is (100+80)/2 = 90, so the % change is 20 / 90 = 22.22%.”
I only know traders who calculate from the starting price (100). There should be an option to switch to the entry as the basis for this calculation.
Thank you for considering.