I would love to understand how to solve this problem: Ray buys a pack of hamburger meat for $5.00, a box of crackers for $3.50, 4 bags of frozen vegetables at $2.00 per bag and a pack of cheese for $3.50 at the grocery store.  Because he is a store rewards member, he gets 10% off of his purchase.  What does his total grocery bill come to?
Can you explain?