Electricity Rates Commonwealth Edison Company’s charge for electricity in January 2014 was 8.21¢ per kilowatt-hour. In addition, each monthly bill contains a customer charge of $15.37. If last year’s bills ranged from a low of $72.84 to a high of $237.04, over what range did usage vary (in kilowatt-hours)?
Source: Commonwealth Edison Co., 2014.
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