A worker is responsible for loading and unloading production machine. The load unload elements in the repetitive work cycle have a normal time of only 24 sec andthe machine cycle time is 2.53 min. One part is produced each cycle. Every sixth cycle the operator must replace the tote pans of parts which takes 2.40 minutes(normal time). For setting the standard time the pfd allowance factor is 15% and themachine allowance factor is 15%. Determine the standard time under the following assumptions: (a) the irregular element is performed as an external element and (b) the irregular element is performed as an internal element

PLEASE CALCULATE T_nw (worker controlled time) first