Cullumber Corporation manufactures and sells three different types of binoculars. They are referred to as Good, Better, and Best binoculars. Grinding and polishing time is limited. More time is required to grind and polish the lenses used in the Better and Best binoculars. Additional unit information is provided below. Product Good Better Best Selling price $91.50 $319.50 $910.00 Variable costs and expenses 49.00 180.00 478.00 Contribution margin $42.50 $139.50 $432.00 Grinding and polishing time required 0.50 hrs 1.50 hrs 6 hrs (a) Your answer is correct.