A professional audit firm charged juniors at $50 per hour, seniors at S200 per hour and the overhead rate for both was 200 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 8 junior hours and 3 senior hours what was the fee charged? Select one: O a. $3150 b. $2100 c. $1050 d. 53000