Build a payback calculator for justifying the sale of a health program investment

Build a savings calculator to show a prospective client if they have one or more of the diseases listed on the attached file, how soon their payback would be on their investment of $7000. Ideas for payback or ROI calculator would be a 1, 5, 10, 15 years savings - depending on how many diseases they checked off. The costs of each disease would be added up in the background and the cost of the program would be shown. The saving could be shown in a graph format. I would like to be able to send this to a customer via email or develop for use on a website or landing page.