In a manufacturing process, five workers could produce $60$ units

per hour. Labor costs are $$\frac{15}{?}$ hour, and material cost is $$20/$unit$.$

Overhead is charged at $1\mathrm{.}5$ times direct labor cost. Finished units

sell for $$40$ each. What is the multifactor productivity associated

with the process?

$0\mathrm{.}828$

$12$

$1\mathrm{.}882$

$1\mathrm{.}85$

$1\mathrm{.}73$