Consider a Small, Remote Town with Only One Employer -

Consider a small, remote town with only one employer - a gold mining firm. Suppose the current work force is 875 workers, each of whom is paid $6000 per month. In order to attract one additional worker , the employer must increase the wage to $6025 per month. The marginal cost of this additional worker is

A) $5.28 million per month.
B) $27 900 per month.
C) $21 875 per month.
D) $5.25 million per month.
E) $21 900 per month.