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Usage of Iron everyday = 1000W
Per day = 1000 x 1/2( 1 hour = 60 m , 30 m = 1/2 hours)
=> 500W
Usage of Geyser everyday = 2000W
Per day = 2000 x 1
=> 2000
Usage of 7 bulb everyday = 100W
Per day = 100 x 3
=> 300W
Every day's usage = 500 + 2000 + 300
Total => 2800 W per day
1 kw = 1000w
2800 W = 2.8KW per day
Month reading = 3.1(In Kw) (reading of first day) + 2.8 x 29 ( Power usage of first day is given)( June has 30 days)
Total monthly => 84.3 KW
1kw = unit
Cost of 1 unit = 4 rupees
Monthly Cost = 4 x 84.3
=> 337.2 Rupees
Approx. -> 337 rupees
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