39. A foreperson supervises A, B, and eight other employees. The foreperson states that he spends twice as much time supervising A and half as much time supervising B, compared with the average time spent supervising his other subordinates. All employees have the same production rate. On the basis of equal cost per unit production, what monthly salary is justified for B if the foreperson gets $3,800 per month and A gets $3,000 per month?

(a) $3,543

(b) $3,800

(c) $3,000

(d) $2,457

(e) $3,400