Hi I am doing a vending Machine application. Now I can insert denominations from 5 10 20 50 1pound and 2 pounds. Is there a way of filtering the most efficent coin combination to pay for the snack. e.g. I have a snack for 45 pence. I insert 2 pounds and 50 pence. I want the machine to be able to determine which is the most efficen coins to use.