Maria and Darryl are selling fruit for a school fundraiser. Customers can buy small boxes of grapefruit and large boxes of grapefruit. Maria sold 4 small boxes of grapefruit and 6 large boxes of grapefruit for a total of $52. Darryl sold 1 small box of grapefruit and 12 large boxes of grapefruit for a total of $76. Find the cost of each different size of grapefruit boxes, a small box of grapefruit and a large grapefruit box of grapefruit.