i try to build up a Form for a Sales Funnel. 

For that i create a Form with several Fields, including my List Price and a Discount. I can calculate the discount and can calculate a new Sum. But i would like to see it on the Form too. 

So - 

Listprice: 100 $ (User Type in)

Discount: 10 % (User Type in)

Sum = 990 $ (Seen on Screen, Calculated)

Anonye out there, who can help me?