Basic Invoice Script for Adobe Acrobat

I only want to pay $30 for this task. I am working with a form made on Adobe Acrobat (livecycle Designer.) I want the work order to automatically calculate quantity x price = extension. Then I want it to have subtotal, discount, adjusted subtotal, tax, labor, and TOTAL Balance. I'd also like the total price to be refelected a different page with Total Balance, Retainer Amount(50%) and Remaining Balance(50%). You will see a screen image of how it should look, but these numbers were entered in manually. I don't know how to setup these script necessary or I would do them myself. Thanks.