Bruce Corporation makes four products in a single facility. These products have the following unit product costs: 3 Direct materials Direct labor Variable manufacturing overhead Pixed manufacturing over head Unit product cost Products B D $13.40 $ 9.30 $10.10 $ 9.70 18.50 26.50 32.70 39.50 3.40 1.80 1.70 2.30 25.60 33.90 25.70 36.30 $60.90 $71.50 $70.20 $87.80 Additional data concerning these products are listed below. Grinding minutes per unit Selling price per unit Variable selling cost per unit Monthly demand in unita Products A B D 2.90 3.80 3.40 2.50 $75.20 $92.60 $86.50 $103.30 $ 1.30 $ 0.30 $ 2.40 $ 0.70 3,100 3,100 2,100 2,300 The grinding machines are potentially the constraint in the production facility. A total of 52,800 minutes are available per month on these machines Direct labor is a variable cost in this company, How many minutes of grinding machine time would be required to satisfy demand for all four products