Bakery R Us uses a set model to determine the total cost of a package of chocolate mini cakes purchased through Amazon Prime’s membership. The base handling fee, on any package, is $4.00. The cost for the first 20 chocolate mini cakes is $8.00 per mini cakes. If you order more than 20 chocolate mini cakes, Bakery R Us gives you a deal and only charges $5.50 for each additional chocolate mini cake that you order over 20. Bakery R Us limits the number of chocolate mini cakes that can be ordered to 50 chocolate mini cakes per order