Bacon company makes four products in a single facility. these products have the following unit product costs: products a b c d direct materials $ 14.95 $ 10.85 $ 11.65 $ 11.25 direct labor 20.05 28.05 34.25 41.05 variable manufacturing overhead 4.95 3.35 3.25 3.85 fixed manufacturing overhead 27.15 35.45 27.25 37.85 unit product cost $ 67.10 $ 77.70 $ 76.40 $ 94.00 additional data concerning these products are listed below. products a b c d grinding minutes per unit 3.80 5.30 4.30 3.40 selling price per unit $ 76.75 $ 94.15 $ 88.05 $ 104.85 variable selling cost per unit $ 2.85 $ 1.85 $ 3.95 $ 2.25 monthly demand in units 4,260 4,260 3,260 2,260 the grinding machines are the constraint in the production facility. a total of 54,900 minutes is 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?