There are 5 rooms in a house. Each room has a 100W bulb and a 40W tube light. If every day the bulb is used for 1 hour and tube light is used for 5 hours in each room then what will be the cost of total electric energy consumed in 30 days when 1 unit of electric energy costs ₹ 2.5?
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Electricity bill for 30 days = Rs. 112.50
Explanation:
Total consumption of electricity per room = 1 hour of bulb + 5 hours of tubelight.
= 100 W + 5 * 40 W
= 300 W
Total consumption of electricity for all rooms per day = 5 * 300 = 1500 W
Electricity consumption for 30 days = 1500 * 30 = 45,000 W = 45 units.
Cost of one unit = Rs. 2.50
Cost of 45 units = 2.5 * 45 = Rs. 112.50
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