Variable Ticket Price

I’m looking into buying Events Calendar Pro and Event Tickets Plus but just wondered if the below was possible:
We have a course with a set number of places but we only want to charge them a fee if they are coming to resit the course. If it is their first time then it is free. So I want, when the user has chosen an available course, it then has a drop down asking if it is a resit or their first time and if it is a resit then it charges them £80 but if not then it is free.
Is this possible?
So basically it’s like a variable product that changes the ticket price according to what options you select but whatever you select one ticket is sold on the event. So maybe other people would change the price according to food option, with or without a t-shirt etc