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An ideal refrigerator removes heat at a rate of 0.15kW from an interior temperature of 1 degree celsius. The exhaust from the refrigerator is 45 degrees celsius. How much electrical power is used.

*Note that this is a refrigerator problem (reverse process from a carnot engine)

I have found the efficiency using Th/Tc - 1 = .29 I do not know how to proceed after this.