$3-39.$ 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$