"pro-rata" pricing

[nadereh]

Hi, I run a class for kids that runs for 10 weeks. Usually people pay for the entire term ie 10 classes , at the beginning. I want to introduce a feature where, if they join partway through the term, they can pay for the remainder of classes. How can this be automated on Weebly?

[Adam7]

I think you'd probably need to add a product option for the number of classes, so people can either pay for all 10, or select a smaller number of only 5 remain as an example.