Assume that producing 1 unit of calcium requires 0 units of calcium, 0.4 units of hydrogen, and 0.8 units of sea salt; that producing 1 unit of hydrogen requires 0.1 units of calcium, 0.3 units of hydrogen, and 0.7 units of sea salt; and that producing 1 unit of sea salt requires 0 units of calcium, 0.3 units of hydrogen, and 0.2 units of sea salt. Find the production schedule that satisfies an external demand for 44 units of calcium, 23 units of hydrogen, and 11 units of sea salt. X =