Grant Company owns four machines that provide 16,950 machine hours per year Part X requires 1.5 hours, and Party requires 0.hours. The respective and Yare $57 and $33. Ir a maximum of 22,500 units of each part can be sold, what is optimal mix of parts contre margins for Part X a Part X: 8,475 units; Part Y: 22,500 units b. Part X: 3,800 units; Part Y: 22,500 units c. Part X: 22,500 units; Part Y: 22,500 units d. Part X: 3,800 units; Part Y: 14,025 units