A linear programming computer package is needed. Western Family Steakhouse offers a variety of low-cost meals and quick service. Other than management, the steakhouse operates with two full-time employees who work 8 hours per day. The rest of the employees are part-time employees who are scheduled for 4-hour shifts during peak meal times. On Saturdays the steakhouse is open from 11:00 a.m. to 10:00 p.m. Management wants to develop a schedule for part-time employees that will minimize labor costs and still provide excellent customer service. The average wage rate for the part-time employees is 57.60 per hour. The total number of full-time and part-time employees needed varies with the time of day as shown Time Number of Employees Needed 11:00 a.m.-Noon 9 9 Noon1:00p.m. 1:00p.m. -2:00p.m. 9 2:00 p.m.-3:00 p.m. 3 3:00 p.m.-4:00p.m. 3 4:00 p.m.-5:00p.m. 3 5:00 p.m.-6:00 pm 6 6:00 pm - 7:00 pm 12 7:00 pm-8:00p.m. 12 8:00 p.m.-9:00 pm 7 9:00 pm-10:00 pm 7 One full-time employee comes on duty at 11:00 a.m., works 4 hours, takes an hour off, and returns for another 4 hours. The other full- time employee comes to work at 1:00p.m. and works the same 4-hours-on, 1-hour-off, 4-hours-on pattern. (a) Develop a minimum-cost schedule for part-time employees. (Let x = the number of part-time employees who start work beginning at hour, where i = 1 = 11:00 a.m., i = 2 = Noon, etc). Min s.t. 11:00 a.m. Noon 1:00 pm 2:00 pm 3:00 p.m. 4:00 pm 5:00 pm 6:00 pm 7:00 p.m. 8:00 p.m. 9:00 p.m. **, 20 Find the optimal solution. (b) What is the total payroll (in $) for the part-time employees? $ How many part-time shifts are needed? shifts Use the surplus variables to comment on the desirability of scheduling at least some of the part-time employees for 3-hour shifts. This answer has not been graded yet. (c) Assume that part-time employees can be assigned either a 3-hour or a 4-hour shift. Develop a minimum-cost schedule for the part-time employees. (Let x be the same variables from part a. Let y = the number of part-time employees who start work beginning at hour i where i = 1 = 11:00 a.m. i = 2 = Noon, etc). Min s.t 11:00 a.m. Noon 1:00 pm 2:00 p.m. 3:00 pm. 4:00 p.m. 5:00 pm 6:00 p.m. 7:00 pm 8:00 p.m. 9:00 p.m. * 1 *z: X3*41*5*XXXy: Y Y Y Y Yo Yo Yo Yg Yg 20 Find the optimal solution. (*j*Xys*z***s *****g1Yy! Yz. Ygr Ya! Y5rYGYr: YgY) How many part-time shifts are needed, and what is the cost savings compared to the previous schedule? part-time shifts needed cost savings $