Commission estimate calculator

I would like to put together some kind of estimate calculator on my website, so that sellers can work out how much potential $ they can make. I have attached a very simple mockup to this message. The calculation and data need to be server side as I don't want to share my data - it has taken me a while to gather it. PHP would be a perfect choice but please put forward any other solution you may have. There is no need for users to be able to save their estimate, nor to login to my site to use this system. I am planning on putting this into a 'CMS' page in Prestashop, but if that's impossible, then we can look at other avenues. Example: - Exam: A-level (21,000 schools in total - this figure is not super relevant in any of the calculations) - Subject: Maths (19,000 schools offer this subject) - Template course: $10 (same for all) - Standard course: $99 (same for all) - Complete course: $299 (same for all) - Question bank: $99 (same for all) - Commission for downloads: 70% of sales - Commission for subscription: 30% of sales 1% market share for template course (maths) for downloads only: ((subject * template course price) * market share)*commission for downloads) ==> Potential commission is $1,330 Please let me know what you think, if this is something you could do, or if you need extra explanations. Thanks