Bruce Corporation makes four products in a single facility. These products have the following unit product costs: Products A C $13.80 $ 9.70 $10.50 $10.10 Direct materials 18.90 Direct labor 39.90 26.90 33.10 Variable manufacturing overhead 3.80 2.20 2.10 2.70 26.00 Fixed manufacturing overhead Unit product cost 34.30 26.10 36.70 $62.50 $73.10 $71.80 $89.40 Additional data concerning these products are listed below Products A C Grinding minutes per unit Selling price per unit Variable selling cost per unit 4.60 3.80 2.90 3.30 $75.60 $93.00 $86.90 $103.70 $ 1.70 $ 0.70 $ 2.80 $ 1.10 Monthly demand in units 3,500 2,500 2,700 3,500 The grinding machines are potentially the constraint in the production facility. A total of 53,200 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