Question: Nancy is using a heat pump pool heater to keep her swimming pool at while the surrounding air is . This requires the heater to

Nancy is using a heat pump pool heater to keep her swimming pool at
while the surrounding air is
. This requires the heater to extract thermal energy from the air at a rate of
. While heating the pool, the pump consumes electrical energy at a rate of
. At what percent of its theoretical maximum coefficient of performance is the pool heater operating?

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