$($Ch$.1)$ Use the information in the table below. Workers are paid at a rate of $$10$ per hour, and overhead is charged at $140\%($or $1\mathrm{.}4$ times$)$ labor costs. Finished switches sell for $$20/$unit$.$

a$.$ Calculate the multifactor productivity for the current process. b$.$ Calculate the multifactor productivity for the new process.

c$.$ Determine if the new process should be implemented.