[a] A time study was conducted on an assembly job consisting of three elements in a cycle in a normal 8-hour shift. For every eight cycles, the operator must exchange parts containers which took 1.60 minutes, rated at 95%. The study was conducted using cumulative timing method along with the performance rating. Stopwatch readings in hundredth of a minute and the rating factors are given in Table 4[a]. Table 4[a] Stopwatch readings (hundredth of a minute) Rating Element 1 2 3 4 5 (%) 1 10 73 139 203 266 80 2 25 88 155 218 280 100 3 64 128 193 257 320 110 (i) If the operator is given 30 minutes lunch break and 20 minutes breaks for personal time and fatigue, compute the PFD allowance factor, Apfd that should be added into the standard time computation. (ii) Calculate the standard time in second using the PFD allowance factor obtained in (i). (ii) Determine the worker's efficiency if the operator completes 600 parts in a normal 8-hour shift. [a] A time study was conducted on an assembly job consisting of three elements in a cycle in a normal 8-hour shift. For every eight cycles, the operator must exchange parts containers which took 1.60 minutes, rated at 95%. The study was conducted using cumulative timing method along with the performance rating. Stopwatch readings in hundredth of a minute and the rating factors are given in Table 4[a]. Table 4[a] Stopwatch readings (hundredth of a minute) Rating Element 1 2 3 4 5 (%) 1 10 73 139 203 266 80 2 25 88 155 218 280 100 3 64 128 193 257 320 110 (i) If the operator is given 30 minutes lunch break and 20 minutes breaks for personal time and fatigue, compute the PFD allowance factor, Apfd that should be added into the standard time computation. (ii) Calculate the standard time in second using the PFD allowance factor obtained in (i). (ii) Determine the worker's efficiency if the operator completes 600 parts in a normal 8-hour shift