Answer:
They should give out a coffee cup to each person and charge full price for the first time that you fill the cup but then after they finish the first drink they should offer a discount if you reuse the same cup. They should tell you that you can bring back coffee cups from even a few days ago and you could still be eligible for the discount. This way even people that don't drink as much coffee can still be eligible to get a discount on their coffee.
Explanation:
:)
 
        
             
        
        
        
hey 
I'm going to college for game design.
one of the best languages and the one I'm studying in is c# it is used in unity and many other game engines but there are many more. Just to list a few c++, Java, and many more it is up to you. if you would like more info about this just let me know By the way what game are you planning to make that is one of the most important factors 
Hope this helps 
-scav