Rob and Wilbur are selling fruit for a school fundraiser. Customers can buy small boxes of grapefruit and large boxes of grapefruit. Rob sold 12 small boxes of grapefruit and 7 large boxes
of grapefruit for a total of $296. Wilbur sold 6 small boxes of grapefruit and 14 large boxes of
grapefruit for a total of $358. Find the cost each of one small box of grapefruit and one large box
of grapefruit