A Manager of a Firm with Market Power Faces the Marginal

A manager of a firm with market power faces the marginal revenue product and average revenue product curves shown below.The firm incurs weekly fixed costs of $1,800.The firm employs a single variable input,labor,which costs $600 per worker each week. Given the above,the maximum profit the firm can earn is _____________.

A) $4,800 per week.
B) $3,000 per week.
C) $2,400 per week.
D) $1,800 per week.
E) -$1,800 per week.