HiEnd Rugs manufactures silk and wool fiber rugs. Their warehouse has 2,400 lots of silk fiber and 1,800 lots of wool fiber available during the week of May 5 for production of their Premier and Elegant lines of carpets. A roll of Premier uses 40 lots of silk and 20 lots of wool. A roll of Elegant uses 30 lots of silk and 30 lots of wool. They make a profit of $300 per roll on the Premier and $500 per roll on the Elegant. How many rolls of each type should they manufacture during this week to maximize profit?