Package Price Different from Performance Prices? (in other words, by the package and get a class free)

My museum is offering an April Break set of kids studio classes. We want the ability to sell them as 3 separate classes, and as a package if the parents want. That part is easy enough. 

My boss decided to "up-the-ante" per se by saying let's make the package cheaper. So each class will be $25, but if they buy the 3-day package its only $50. How do I build that where the package is a cheaper price and still get the attendance data to be correct? The attendance still needs to show that 3 tickets were sold for 3 different days. 

Is this possible to build? 

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