The Apex Television Company has to decide no the number of 27" and 20" LCD monitors to produce at one of its factories. Market research indicate that at most 40 of the 27" sets and 10 of the 20" set can be sold per month. A 27" set requires 20 work hours and a 20" set requires 10 work-hours. The maximum number of work hours available is 500 hours. Each 27" set sold produces a profit of $120 and each 20" set produces a profit of $80. What is the maximum profit Apex could achieve?