Bruce Corporation makes four products in a single facility. These products have the following unit product costs: oduct Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Unit product cost 3.10 $ 9.00 $ 9.80 $ 9.40 26.20 32.40 39.20 1.50 1.40 33.60 25.40 36 9.70 $70.3e $69.ee $86 Additional data concerning these products are listed below. Grinding minutes per unit Selling price per unit Variable selling cost per unit Monthly demand in units 2.60 3.20 3.10 2.20 $74.99 $92.30 $86.20 $1e3.ee $1.00 $0.00 $ 2.10 $ 0,40 2.8ee 2.see 1.see 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