1000 watt per hour consumption of electricity is known as 1 unit and cost of 1 unit electricity is

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23 Dec 2009 electricity bill

1000 watt per hour consumption of electricity is known as 1 unit and cost of 1 unit electricity is Rs 2.15. Mr Gupta has the following electrical apparatus in his home-
No. Apparatus Power Hours of utilization
1. 2 electricity bulb 100 watt 2 Hrs. 12 min per day
2. 4 tube light 40 watt 6 Hrs. 6 min per day
3. 1 room heater 1000 watt 3 Hrs. 42 min per day
4. 1 television 60 watt 2 Hrs. 30 min per day
5. 1 computer 100 watt 1 Hrs. 36 min per day
6. 1 washing machine 100 watt 3 Hrs. 30 min per week
The bill of electricity of Mr Gupta in a month of 30 days is

OPtion

1) 288
2) 348
3) 422
4) 402
5) 325
6) 353
7) 417
8) 421
9) 298
10) 279

Solution

Watt-Hour per day
for bulbs = 2*100*2.2 = 440
for tubes = 4*40*6.1 = 976
for heater = 1*1000*3.7 = 3700
for television = 1*60*2.5 = 150
for computer = 1*100*1.6 = 160
for machine = 1*100*3.5/7 = 50
Total Watt Hour per day for all the apparatus = 5476
Monthly Watt Hour consumed = 5476*30 = 164280 Kilowatt consumed = 164.28
Total Bill of consumption = 164.28*2.15 = 353.202 = 353 approx

Correct Option: 6 Best Solution (0)