Trucks arrlve at the loading dock of a wholesale grocer at the rate of $1\mathrm{.}2$ per hour. A single crew consisting of two workers can load a

truck in about $30$ minutes. Crew members recelve $$10$ per hour In wages and fringe benefits, and trucks and drlvers reflect an hourly

cost of $$67.$ The manager is thinking of adding another member to the crew. The service rate would then be $2\mathrm{.}4$ trucks per hour.

Assume rates are Polsson. Use Table $1$ and Table $2$

$10$

a$.$ Would the third crew member be economical? $($Round your intermedlate and final answer to $2$ decimal places.$)$

Answer is complete but not entirely correct.

Yes

because, the total cost is

$590\mathrm{.}00ox$

b$.$ Would a fourth member be Justlfiable if the resulting service capacity were $3$ trucks per hour? $($Round your Intermediate and

final answer to $2$ decimal places.$)$

Answer is complete but not entirely correct.

Yes

because, the total cost is

$$,0\mathrm{.}86ox$