Questions $184-189$ are based on the following information:

Estimate:

$1950$ units of material

Crew size $-4$ workers

Total duration $-15$ weeks

Workers work $8$ hrs per day $5$ days a week

After $6$ weeks:

$700$ units of material placed

$200$ crew hours expended

$$8,224\mathrm{.}00$ labor spent

$187.$ What is the actual crew productivity rate in units per hour?

a$.29$

b$.3\mathrm{.}25$

c$.3\mathrm{.}5$

d$.7\mathrm{.}0$