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INDIAN ELECTRICITY BILL PRICE HAVE RISEN FROM RUPEES 6.4 TO 6.5 PER UNIT .ARVI'S FACTORY EXPECTED TO USE 600 UNITS IN THE NEXT BILLING PERIOD.HE INSTALLED SOLAR PANELS AT THE START OF THAT PERIOD.THIS REDUCED HIS ELECTRICITY USAGE BY 90%. HOW MUCH DID ARVI'S BILL INCREASE?
Total usage = (100 - 90) % = 10 %
10 % of 600 units = 60 units.
cost of 60 units before price hike = 60 x 6.4 = Rs 384
Cost of 60 units after price hike = 60 x 6.5 = Rs 390
:., Price difference = Rs 390 - 384 = Rs 6


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