Kim and Mike are selling wrapping paper for a school fundraiser. Customers can buy rolls of plain wrapping paper and rolls of holiday wrapping paper. Kim sold 8
rolls of plain wrapping paper and 5 rolls of holiday wrapping paper for a total of
$215. Mike sold 11 rolls of plain wrapping paper and 14 rolls of holiday wrapping
paper for a total of $431. Find the cost each of one roll of plain wrapping paper
and one roll of holiday wrapping paper.