solving for b, don't know what I'm doing wrong but I get wrong cost for current layout. someone please help me with this

.. 9.2 A Missouri job shop has four departments-machin- ing (M), dipping in a chemical bath (D), finishing (F), and plating (P)-assigned to four work areas. The operations manager, Mary Marrs, has gathered the following data for this job shop as it is currently laid out (Plan A). 100s of Workpieces Moved Between Work Areas Each Year Plan A M D F M 6 18 2 D 4 2 18 F P Distances Between Work Areas (Departments) in Feet M D M 20 12 8 D 6 10 F 4 P It costs $0.50 to move workpiece 1 foot in the job shop. Marrs's goal is to find a layout that has the lowest material han- dling cost. a) Determine cost of the current layout, Plan A, from the data above. b) One alternative is to switch those departments with the high loads, namely, finishing (F) and plating (P), which alters the distance between them and machining (M) and dipping (D), as follows: Distances Between Work Areas (Departments) in Feet Plan B M D M 20 8 12 D 10 6 F 4 What is the cost of this layout? c) Marrs now wants you to evaluate Plan C, which also switches milling (M) and drilling (D), below. Distance Between Work Areas (Departments) in Feet Plan C M D M 20 10 6 D 8 12 F III 4 P What is the cost of this layout? d) Which layout is best from a cost perspective? PX A B D E G H LOON 0009 1 Layout Enter the flow table and the distance table in the shaded area. Then either enter the 2. Min Load Distance Set D(j,i)=D(ij) room NUMBERS into which you want to place each process in the column labeled 3 'Room assignment' or use the SOLVE button to find the optimal layout. 4 Data Assigned Flow/Load Room Table Dept. 1 Dept. 2 Dept. 3 Dept. 4 Room 1 Dept. 1 20 8 12 Room 2 Dept. 2 10 6 8 Room 3 Dept. 3 4 Room 4 Dept. 4 10 NOTE: The distance from Room) to Room I should not be a blank but should be the same as the distance from Room I to Room). Assigned Distance/C 11 Dept ost table Room 1 Room 2 Room 3 Room 4 12 Dept. 1 Room 1 20 10 6 13 Dept. 2 Room 2 8 12 14 Dept. 3 Room 3 4 15 Dept. 4 Room 4 16 17 Total movement 720 Cost/Movem 0.5 Total cost 360 18 19 Movement computations Second Cost/Distan 20 First dept Second dept Load/Flow First room room Product 21 Dept. 1 Dept. 1 O Room 1 Room 1 0 22 Dept. 1 Dept. 2 20 Room 1 Room 2 20 23 Dept. 1 Dept. 3 8 Room 1 Room 3 10 80 24 Dept. 1 Dept. 4 12 Room 1 Room 4 72 25 Dept. 2 Dept. 1 O Room 2 Room 1 0 26 Dept. 2 Dept. 2 O Room 2 Room 2 0 27 Dept. 2 Dept. 3 10 Room 2 Room 3 80 28 Dept. 2 Dept. 4 6 Room 2 Room 4 12 72 29 Dept. 3 Dept. 1 O Room 3 Room 1 0 30 Dept. 3 Dept. 2 0 Room 3 Room 2 0 31 Dept. 3 Dept. 3 0 Room 3 Room 3 0 32 Dept. 3 Dept. 4 4 Room 3 Room 4 16 33 Dept. 4 Dept. 1 O Room 4 Room 1 0 34 Dept. 4 Dept. 2 0 Room 4 Room 2 0 35 Dept. 4 Dept. 3 0 Room 4 Room 3 0 36 Dept. 4 Dept. 4 O Room 4 Room 4 0 37 400 8