Underneath is the list of appliances used in a house in one day; find out the amount of electricity bill for a month of 30 days if the cost of one unit is Rs. 3. (a) A TV of 100 W for 8 h (b) A refrigerator of 300 W for 24 h (c) 3 bulbs of 50 W for 4 h (d) 2 tube lights of 40 W for 8 h