Mei and scott are selling wrapping paper for school fundraiser. customers can buy rolls of plain wrapping paper and rolls of holiday wrapping paper. mei sold 6 rolls of plain wrapping paper and 3 rolls of holiday wrapping paper for a total of $90. scott sold 1 roll of plain wrapping paper and 4 rolls of holiday wrapping paper for a total of $71. what is the cost of each one roll of plain wrapping paper and one roll of holiday wrapping paper?