Question

calculate the electricity bill amount for the month of July if 3 bulbs of 40 watts for 6 hour ,5 tubelight light of 60 watts for 6 hours,a tv of 100 watts for 4 hours are used per day the cost per unit is 2.25 rupees

Answer 1

Electric energy consumed per day by 4 bulbs = 4x40 x5 = 800Wh

Electric energy consumed per day by 4 lights = 4x60x5 =1200 Wh

Electric energy consumed per day by TV = 100x6 = 600 Wh

Electric energy consumed per day by washing machine = 400x3 =1200 Wh  

.’. Total electric energy consumed by all electric appliances = (800+ 1200 + 600+ 1200)Wh = 3800 Wh = 3.8 kWh =3.8 units  

Total electric energy consumed in the month of April (30 days) = 3.8 x 30 = 114units  

Cost of one unit = Rs. 1.80

Cost of 114 units = 114 x 1.80 = X 205.20 .:. Electricity bill amount = Rs 205.20

Answer 2

first of all calculate energy saprately of each by Formula E=P*T than add all energy and you will get energy consumed on a day than multiplay by 31 day in July month and than multiplay by the rate 2.25

your answer is 203.625