A worker is responsible for loading and unloading a production machine. The load$/$unload elements in the repetitive work cycle have a normal time of only $45$ sec$,$ and the machine cycle time is $4\mathrm{.}75$ min. One part is produced each cycle. Every $5$th cycle, the operator must replace the tote pans of parts, which takes $3\mathrm{.}00$ min $($normal time$).$ For setting the standard time, the PFD allowance factor is $15\%,$ and the machine allowance factor is $15\%.$Determine the standard time under the following alternative assumptions:the irregular element isperformed as an external element.