Jack bought 2 boxes of donuts and 3 cupcakes for $35.90.Ivy bought 5 boxes of donuts and 7 cupcakes for $87.60.
a) Find the cost of a box of donuts and the cost of a cupcake
b) Cindy gave the cashier $100 for 3 boxes of donuts and 4 cupcakes .Howmuch change will Cindy recieve?