I am looking to have a specific type of form and am curious to see if this is something Gravity forms can do. Every month, members have to pay a fee and the fee is based on how many lessons they give. There are specific discounts associated with different amounts of lessons. For instance, if you taught 30 lessons in a week, you would get a 5% discount. So I'm looking for a form that will calculate the total price from each week on a monthly basis. Does this type of form exist through Gravity Forms?