Calculation Form for a website

I need a simple javascript calculation script where website visitors will enter some numbers and then hit a calculate. The form will show the results of the calculation based on a formula I will provide. The form should have a reset or clear button so new values can be inputted. ## Deliverables The website visitor would enter the following fields A. Average monthly # of hearing aids sold: ___ B. Average cost of hearing aid sold: ____ C. Percent of sales that currently come from your site: ____ On average Autus clients generate at least 20% of sales from the online marketing engine we provide. How much more could you be making per year (Calculate button) RESULTS : Additional revenue $ _____ per year -------------------- Formula to be used. (A times B) (.2-C) times 12 = Let me know if there are any questions?