The Apex Television Company has to decide on the number of 65 and 55 sets to be produced at one of its factories. Market research indicates that at most 280 of the 65 sets anc 70 of the 55 sets can be sold per month. The maximum number of work-hours available is 3,800 per month. A 65 set requires 20 work.thours and a 55 set requires 10 work thours. Each 65 set sold produces a profit of $270 and each 55 "set produces a profit of $180. A wholesaler has agreed to purchase all the television sets produced if the numbers do not exceed the maxima indicated by the market research