Bruce Corporation makes four products in a single facility. These products have the following unit product costs: Additional data concerning these products are listed below. The grinding machines are potentially the constraint in the production facility. A total of 9,000 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? Multiple Cholce 12.000 10,800 9,800 10,500