A factory producing the 150 electric bulbs a day, involves direct material cost of Rs. 250/-, direct labor cost of Rs. 200/- and factory overheads of Rs. 225/-. Assuming a profit of 10% of the selling price, and overheads 30% of the factory cost, what is the selling price of one electric bulb?
(a) Rs. 6.50 (b) Rs. 12.50
(c) Rs. 18.50 (d) Rs. 21.00