Input for number of pages to calculate pricing
I would like to have an option where the client types in the number of pages they would like in their book and the price is calculated based on what they input. The base cost for 20 pages and then $1.50 for every page on top of that. It would probably be at the bottom of a form where they select some other options and then hit submit. Then it would take them to the shopping cart so they can pay for their book. Is something like that possible? I know that I can create a drop down with product options but I don't want to have to make an option for every number from 20 to 100...