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A home is to be maintained at 70F, and the external temperature is 50F. One method of heating the home is to purchase work from

A home is to be maintained at 70F, and the external temperature is 50F. One method of heating the home is to purchase work from the power company and to convert it directly into heat: This is the method used in common electric room heaters. Alternatively, the purchased work can be used to operate a heat pump. What is the ratio of the costs if the heat pump attains the ideal thermodynamic coefficient of performance?

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