16.John employs 30 men in his construction site. He pays them $50 per hour and they all work maximum hours. To employ one more man he would have to raise the wage rate to $50.50 per man hour for all workers. If all other costs remain constant, the marginal cost per hour of labour is now:

Select one:

a.

$50.50

b.

$50.02

c.

$0.50

d.

$65.50