Sally Sethness assembles stereo equipment for resale in her shop. She sells two products, turntables and cassette players (this is a really old problem). She makes a profit of $10 on each turntable and $6 on each cassette player. Both products must go through two steps in her shop, assembly and bench checking. A turntable takes 12 hours to assemble and 4 hours to bench check. A cassette player takes 4 hours to assemble but 8 hours to bench check. Looking at this month’s schedule, Sally sees that she has 60 assemble hours available and 40 hours of bench checking available. Sally wishes to find the optimal mix of turntables and cassette to maximize profits.