If element b is an internal element performed simultaneously with m$,$ whose observed time is

$0\mathrm{.}56$ min, determine the $($a$)$ normal time, $($b$)$ standard time for the cycle $($use PFD of $10\%$ and

machine allowance of $15\%).$

Work element a b c d

Observed time $($min$)0\mathrm{.}560\mathrm{.}250\mathrm{.}501\mathrm{.}10$

Performance rating $100\%80\%110\%100\%$

Machine element m

Observed time, machine $($idle$)0\mathrm{.}56($idle$)($idle$)$