what chegg had answered for this problem isn't correct, can anyone figure it out?

eBook Problem 4-25 (Algorithmic) 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 $6.1 per hour, but the temp agency managing the part time staff will charge the steakhouse one extra dollar per hour for shifts starting after 3:00 PM. The total number of full-time and part-time employees needed varies with the time of day as shown. Time Total Number of Employees Needed 11:00 a.m. - Noon 7 Noon - 1:00 p.m. 8 9 6 5 5 1:00 p.m. - 2:00 p.m. 2:00 p.m. - 3:00 p.m. 3:00 p.m. - 4:00 p.m. 4:00 p.m. - 5:00 p.m. 5:00 p.m. - 6:00 p.m. 6:00 p.m. - 7:00 p.m. 7:00 p.m. - 8:00 p.m. 8:00 p.m. - 9:00 p.m. 9:00 p.m. - 10:00 p.m. 8 11 10 8 4 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 1:00 P.M. and works the same 4-hours-on, 1-hour-off, 4-hours-on pattern. Previous Next Cu Into es remaining eBook a. Develop a minimum-cost schedule for part-time employees. What is the total payroll for the part-time employees? If required, round your answer to the nearest dollar. Total daily salary cost = $ 608 How many part-time shifts are needed? 20 x Use the surplus variables to comment on the desirability of scheduling at least some of the part-time employees for 3-hour shifts. The input in the box below will not be graded, but may be reviewed and considered by your instructor. W b. 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. If your answer is zero, enter "0". Optimal schedule for part-time employees: Number of part Number of part- Starting Time time employees time employees (4-hour shifts) (3-hour shifts) 0 X 8 X 11:00 A.M. 0 o 12:00 P.M. Previous Next Check My Work 2 more Check My Work uses remaining Save and Exit Submit Assignment for Grading eBook Optimal schedule for part-time employees: Number of part-Number of part- Starting Time time employees time employees (4-hour shifts) (3-hour shifts) 11:00 A.M. 0X 8 x 12:00 P.M. 0 X 0 1:00 P.M. 0 1X 2:00 P.M. o 0 3:00 P.M. 0 X 1 4:00 P.M. 0 0 5:00 P.M. 0 X 4 6:00 P.M. 6 0 7:00 P.M. 0 0 How many part-time shifts are needed? 20 What is the cost savings compared to the previous schedule? If required, round your answer to the nearest cent. Total cost reduced to $ 501.60 X Feedback Previous Next Check My Work 2 more Check My Work uses remaining