How to create a day camp registration form?

Trying to create a camp registration form that allows families to select multiple days from a calendar for their child to attend camp. I want them to be able to select days from a monthly calendar. The biggest challenge I am encountering is with the payment interface. We allow a 10% discount for each additional day. Is there a way to calculate this based on the number of days selected? For example, if they choose 1 day, fee is $125, Day 2 is $112.50, Day 3 is $100, etc. Can you help?

The best way to set this up I can think of would be to have 2 date fields, one for check in and one for check out.  You could then have a calculation field to calculation the number of days:

https://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

Add a number field to the form and use calculations to determine the cost pet day based on the number of days in the calculation field:

https://www.jotform.com/help/268-Conditional-Logic-Inserts-Text-Calculation-Into-A-Field

I am making a quick example form to show you how it would work.  One moment and I will udpate this thread.

Here is an example form to show how it would work:

https://form.jotformpro.com/71557274952970

I only did the conditions for up to 3 days but it will give you an idea of how to set it up.  You can clone it to your own account to inspect further:

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL