Mark and Lea are selling wrapping paper for a school fundraiser. Customers can buy rolls of
plain wrapping paper and rolls of shiny wrapping paper. Mark sold 9 rolls of plain wrapping
paper and 9 rolls of shiny wrapping paper for a total of $117. Lea sold 7 rolls of plain wrapping
paper and 8 rolls of shiny wrapping paper for a total of $99. What is the cost each of one roll of
plain wrapping paper and one roll of shiny wrapping paper?
11