Have the ability to calculate the discount against the gross amount first and apply rounding to the amount prior to calculating against the quantity

In D365 F&O, the sales order invoice calculates the total (Qty*Discount*Gross price).

Our customer has a requirement to calculate using the formula: Gross *Discount = rounded to 2DP then *Qty.

e.g

Customer calculation 334.85* 3% disc = 324.80 * 1000 = 324,800.

System calculation is currently:

1000*334.85*3% discount = 324,804.50.

The customer would like to have the option to calculate using  Gross *Discount = rounded to 2DP then *Qty.