Brown Corporation makes four products in a single facility. These products have the following unit product costs: Products A B C D Direct materials $15.60 $19.50 $12.50 $15.20 Direct labor 17.60 21.00 15.40 9.40 Variable manufacturing overhead 4.40 5.60 8.10 5.10 Fixed manufacturing overhead 27.50 14.40 14.50 16.50 Unit product cost $65.10 $60.50 $50.50 $46.20 Additional data concerning these products are listed below. Products A B C D Grinding minutes per unit 2.00 1.10 0.70 0.30 Selling price per unit $78.70 $71.10 $67.90 $62.60 Variable selling cost per unit $2.60 $3.10 $2.80 $3.50 Monthly demand in units 3,000 2,000 2,000 4,000 The grinding machines are potentially the constraint in the production facility. A total of 10,500 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? 10,500 10,700 11,000 10,800