A professional audit firm charged juniors at $80 per hour, seniors at $300 per hour and the overhead rate for both was 100 per cent on direct labour. The firm added 5 per cent on total cost to arrive at a fee to be charged. If a job took 10 junior hours and 4 senior hours, what was the fee charged?

Select one:

a. $4200

b. $4000

c. $2100

d. $2000