Operation 1: Skin cutting Equipment = Cutting machine Operators = 1 Cycle time = 15 seconds Product changeover time = 30 minutes Average downtime per shift = 39 min Actual average production per shift (good plus reject) = 1505 pairs Average loss per shift = 15 pairs Average inventory of cut pairs = 7,560 pairs Operation 2: Assembly of the shoe Manual operation Operators = 1 Cycle time = 50 seconds Product Change Time = 0 Average downtime per turn = 10 min Actual average production per shift (good plus reject) = 515 pairs Average rework per shift = 5 pairs Average inventory of cut pairs = 3575 pairs Operation 3: Sewing Equipment = Sewing machine Operators = 1 Cycle time = 70 seconds Product changeover time = 10 minutes Average downtime per shift = 20 min Actual average production per shift (good plus reject) = 355 pairs Average rework per shift = 33 pairs Average inventory of cut pairs = 1350 pairs Operation 4: Gluing the sole Equipment = Oven Operators = 1 Cycle time = 35 seconds Product Change Time = 0 Average downtime per shift = 219 min Actual average production per shift (good plus reject) = 387 pairs Average rework per shift = 2 pairs Average inventory of cut pairs = 756 pairs Operation 5: Accessories Manual operation Operators = 1 Cycle time = 30 seconds Product Change Time = 0 Average downtime per shift = 220 min Actual average production per shift (good plus reject) = 455 pairs Average rework per shift = 0 pairs Average inventory of cut pairs = 356 pairs Operation 6: Detailed Manual operation Operators = 1 Cycle time = 25 seconds Product Change Time = 0 Average downtime per shift = 220 min Actual average production per shift (good plus reject) = 550 pairs Average rework per shift = 3 pairs Average inventory of cut pairs = 1652 pairs Operation 7: Packaging Manual operation Operators = 1 Cycle time = 40 seconds Product Change Time = 0 Average downtime per shift = 220 min Actual average production per shift (good plus reject) = 330 pairs Average rework per shift = 0 pairs Average raw material inventory equals 7 manufacturing days Average finished product inventory = 155509 pairs Calculate current work balance efficiency a) 54.08% b) 60.72% c) 67.90% d) 73.03% I tried everything, I put the average downtime as if it were a single day, I counted the production as a single day, but I still don't get any results, I even feel that the problem is wrong, I don't know what to do or if it has trick