Indian electricity bill increased from ₹6.4 to ₹6.5 per unit.Arvi's factory expected athe use 600 units.he installed solar panels at the start of that period.this reduced his usage by 90%.how much does Arvi's bill increase??
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2014-11-19T21:51:09+05:30

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Units = 600 
consumption bill rate = Rs 6.40 / unit    to  Rs 6.50  / unit
Old bill with all units purchased from external electric power supply corporation
              = 600 * 6.40 =  Rs 3, 840
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Let us say now that x units are purchased.
Usage or consumption reduced by 90% it means, it reduced by 600 * 90 /100 = 540 units.

So Arvi's factory used 60 units from power supply corporation and used 540 units from the solar power panels.

Power bill  =  60 * Rs 6.50 = Rs 390

when the rate for power units was Rs 6.40,  he paid for 60 units = 60 * Rs 6.40 = Rs 384

The bill increases by Rs 6  =  390 - 384

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