I am creating a gym membership form - it will offer two different types of memberships at 3 different locations.
All of these options could be housed in a drop down - or not.
Once the user has selected their membership option I will need to add together a couple of lines of fees : so a start up fee + admin fee + (1week of cost+remaining number of days of cost in the week of purchase)
The start up fee and admin fee are known costs $99 and $49. 1 week costs=$10.99. So the mathematical formula in the brackets would be ( if purchased on a sat) $10.99+(10.99*6)/7
The form is a basic payment form other than these calculations.