Bruce Corporation makes four products in a single facility. These products have the following unit product costs: Products Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Unit product cost Additional data concerning these products are listed below. A B C $ 13.10 $ 9.00 $ 9.80 D $ 9.40 18.20 26.20 32.40 39.20 1.40 2.00 25.40 36.00 3.10 25.30 1.50 33.60 $ 59.70 $ 70.30 $ 69.00 $ 86.60. Grinding minutes per unit Selling price per unit Variable selling cost per unit Monthly demand in units Products A 2.60 $ 74.90 B C D $ 1.00 2,800 3.20 $ 92.30 $ 0.00 2,800 3.10 2.20 $ 86.20 $103.00 $ 2.10 $ 0.40 1,800 2,000 The grinding machines are potentially the constraint in the production facility. A total of 52,500 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?