$1\mathrm{.}12$ A high$-$production operation was studied during an $80-$hr period. During that time, a

total of seven equipment breakdowns occurred for a total lost production time of $3\mathrm{.}8$ hr$,$

and the operation produced $38$ defective products. No setups were performed during the

period. The operation cycle consists of a processing time of $2\mathrm{.}14$ min, a part handling time

of $0\mathrm{.}65$ min, and a tool change is required every $25$ parts, which takes $1\mathrm{.}50$ min. Determine

$($a$)$ hourly production rate of acceptable parts and $($b$)$ scrap rate during the period.