A professional audit firm charged juniors at $50 per hour, seniors at $200 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 2 senior hours, what was the fee charged? Select one: a. $900 b. $945 c. $1470 d. $1890