Exhibit 28-7 -Refer to Exhibit 28-7.For Technological Reasons,this Monopsonist Can Hire Labor

Exhibit 28-7

-Refer to Exhibit 28-7.For technological reasons,this monopsonist can hire labor only in increments of 10 workers.The profit-maximizing number of workers is

A) 10.
B) 20.
C) 30.
D) 40.
E) 50.