A factory is producing 1000 bolts and nuts per hour on a machine. It material cost is Rs. 375, labour cost is Rs.245 and the direct expense is Rs. 80. The factory on cost is 150% of the total labour cost. What is the total factory cost?
(a) Rs.106.50 (b) Rs.367.50 (c) Rs. 320.25 (d) Rs.1387.75