ns Problem 13-15 Algo (Solving Integer Optimization Problems with Excel Solver) Question 4 of 5 Check My Work The Northside Bank is working to develop an efficient work schedule for full-time and part-time tellers. The schedule must provide for efficient operation of the bank, including adequate customer service, employee breaks, and so on. On Fridays, the bank is open from 9:00 A.M. to 7:00 P.M. The number of tellers necessary to provide adequate customer service during each hour of operation is summarized here. Time No. of Tellers Time No. of Tellers 9:00 a.m.-10:00 a.m. 6 2:00 p.m.-3:00 p.m. 8 10:00 a.m.-11:00 a.m. 3:00 p.m.-4:00 p.m. 11:00 a.m.-Noon 4:00 p.m.-5:00 p.m. Noon-1:00 p.m. 9 5:00 p.m.-6:00 p.m. 1:00 p.m.-2:00 p.m. 8 6:00 p.m.-7:00 p.m. 7 Each full-time employee starts on the hour and works a 4-hour shift, followed by a 1-hour break and then a 3-hour shift. Part-time employees work one 4-hour shift beginning on the hour. Considering salary and fringe benefits, full-time employees cost the bank $15 per hour ($105 a day), and part-time employees cost the bank $8 per hour ($32 per day). (a) Formulate an integer programming model that can be used to develop a schedule that will satisfy customer service needs at a minimum employee cost. (Hint: Let x/ = number of full-time employees coming on duty at the beginning of hour i and y; = number of part-time employees coming on duty at the beginning of hour j.) If your answer is zero enter "0" and if the constant is "1" it must be entered in the box. Min *9 + *10 + X11 + 19 + y10 + s.t. y11 + xg y12 + x10 + y1 + 12 + X11 y9 + y3 y10 + y11 + y12 + x10 + y1 + 12 + X11 + y3 - Select your answer y10 + y11 + x9 + y12 + Time (9:00 a.m.-10:00 a.m.) x10 + y1 + 12 + x11 + v3 y9 + - Select your answer - y10 + y11 + x9 + y12 + Time (10:00 a.m.-11:00 a.m.) x10 + y1 + X11 y3 ye + y10 + - Select your answer - y11 Time (11:00 a.m.-Noon.) x9 + y12 + x10 + y1 + X11 + 12 + yo + y3 - Select your answer - y10 + V11 + y12 + Time (Noon.-1:00 p.m.) x9 + x10 + y1 + yz + X11 + vs + y10 + y3 - Select your answer - y11 + y12 + Time (1:00 p.m.-2:00 p.m.) x9 + x10 + y1 + 12 + x11 + V3 v9 + - Select your answer y10 + y11 + y12 + Time (2:00 p.m.-3:00 p.m.) x9 + x10 + y1 + 12 + X11 + y9 + y3 - Select your answer - y10 + V11 + 12 + Time (3:00 p.m.-4:00 p.m.) xg + x10 + y1 + X11 + 12 + yo + y3 - Select your answer - y10 + V11 + Time (4:00 p.m.-5:00 p.m.) xg y12 + x10 + y1 + x11 y9 + y10 + y3 - Select your answer - y11 + y12 + Time (5:00 p.m.-6:00 p.m.) xi, yj 2 0 and integer for i = 9, 10, 11 and j = 9, 10, 11, 12, 1, 2, 3 y 1 + 12 + V3 - Select your answer - Time (6:00 p.m.-7:00 p.m.)(h) Solve the LP Relaxation of your model in part (3]. Enter the total tost value under the optimal solution. Total Cost: $ (() Solve for the optimal schedule of tellers. Enter the total number ottullrtime and pl'btlmE employees required. If your answer Is zero enter \"0". Total Number of Fulerime Employees: Total Number of PartrTirrie Employees: (d) After reviewing the solution to part (c), the bank manager realized that some additional requirements must be specied. Specifically, she wants to ensure that one full-time employee is on duty at all times and that there is a staflc of at least three full-time employees. Revise your model to Incorporate these additional requirements, and solve for the optimal solution. Enter the total number of fullrtime and partrlime employees required and the total cost under the revised optimal solution. If required round your answers to the nearest whole number. If your answer is zero enter "D". Total Number of Full-Time Employees: Total Number of Part'Tll't'IE Employees: Total Cost: $