In a hostel, 20 LED bulbs of 15W are used 5 hours daily, 10 electric heaters each of 2 kW are used continuously for 180 minutes a day, 20 water heaters of 1500 W are used for 5 minutes every day, and 20 irons of 800 W are used for 30 minutes every week. What will be the consumption of electricity in a month? What change in the total consumption will be when all heaters of 2 kW are replaced by 1 kW heaters? If the cost of electricity is Rs. 12 per unit, how much money will be saved in a month? [Ans: 1952 units, 10,800 Rs.]​