Natalie and ashley are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. natalie sold 14 small boxes of grapefruit and 8 large boxes of grapefruit for a total of $156. ashley sold 7 small boxes of grapefruit and 10 large boxes of grapefruit for a total of $132. what is the cost of one small box of grapefruit and one large box of grapefruit?