Percentage Fee to cart before sale total

Is it possible to add the cart fee to the cart subtotal before the sale prices instead? Right now it’s set to consider the cart subtotal based on all products current prices including the sale. This is what it would look like:

retail prices * cart fee % = cart fee amount
retail prices + sale items + cart fee amount = new cart subtotal

This is because my website is a wholesale model and I’d want to use the base price of my products times the fee percent instead.