The time to load a starting work part into the production machine in a certain unit

production operation $=0\mathrm{.}40$min, the actual processing time in the operation $=3\mathrm{.}10$

min, and the time to unload the finished part $=0\mathrm{.}20$min. In addition, the tool must

be changed every $5$ cycles and the tool change time $=1\mathrm{.}50$min. The cycle time for

the unit operation is which one of the following?

$($a$)3\mathrm{.}5$min

$($b$)3\mathrm{.}7$min

$($c$)4\mathrm{.}0$min

$($d$)4\mathrm{.}5$min

$($e$)5\mathrm{.}2$min

If the initial cost of a production machine including installation is $$250,000,$ and the

planned use of the machine is $2000h\frac{r}{y}r$ for $5$ years, and the applicable overhead

rate on the equipment is $50\%,$ which one of the following is the corresponding cost

rate of this machine in $\frac{\text{\$}}{h}r?$

$($a$)$ $$0\mathrm{.}625$

$($b$)$ $$25\mathrm{.}00$

$($c$)$ $$37\mathrm{.}50$

$($d$)$ $$50\mathrm{.}00$

$($e$)$ $$125\mathrm{.}00$