Your discount/surcharge percentage is wrong

Did you know that your % for surcharging and discounts is incorrect?
if a discount/surcharge should be 2.9 percent, it only calculates 2%.

We have lodged a ticket with support but they have given us a “work around”.
Can something as basic as this please be fixed?

My guess is it just doesn’t support decimals, so 2.9 gets turned into 2.