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Alex S.

asked • 01/14/15

Word Problem about electricity function

An electricity company charges its customers a base rate of $10 a month, plus 6 cents per kilowatt-hour(kWh) for the first 1200kWh and 7 cents per kWh for all usage over 1200 kWh. Express the monthly cost E as a function of the amount x of electricity used. 

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