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Domestic electricity

The electricity and gas coming into your house pass through
meters which count how much is being used
The amount is measured in units

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The first few units are usually more expensive and there is also
a standing charge to cover maintenance
e.g. meter reading in November 2010 = 10408 units
meter reading in February 2011 = 11942 units
Calculate the electricity bill when the first 50 units
cost 17p and then each unit…

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