there are two 60 Watt lamp and two 80 watt fans in a house.The lamps and fans run 5 hours daily.Find out the expense in a month if an unit of electricity cost Is 4/-.assume one month has 30 days.
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Answers
Answer:the answer is rs 1680
Explanation:
P= 2*60+3*80=280
Rs=280*30*5*4/1000=1680
Therefore the expense in a month is Rs. 84/-.
Given:
The power of the lamp = 60 Watt
The power of the fan = 80 Watt
The period at which both fan and lights = 5 hrs per day
Cost of electricity per unit = Rs. 4/-
Number of fans = 2
Number of lamps = 2
To Find:
The expense in a month.
Solution:
The given question can be solved as shown below.
Number of operating hours in a month = 5 × 30 = 150 hrs
Number of units of electricity consumed by 2 lamps = 60 × 150 = 9,000 = 9 KW-hr
Number of units of electricity consumed by 2 fans = 80 × 150 = 12,000 = 12 KW-hr
Total units of electricity consumed by 2 fans and 2 lamps = 9 + 12 = 21 KW-hr
Cost of electricity per month = Total electricity consumed × Unit cost
Cost of electricity per month = 21 × 4 = Rs. 84/-
Therefore the expense in a month is Rs. 84/-.
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