The capacity and compressor-work characteristics for a 3-ton (600-Btu/min) vapor-compression air conditioner are given in the table, along with the seasonal house-cooling needs. If electricity costs 5 cents/kW · hr, determine the seasonal operating cost and the seasonal coefficient of performance.

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Ambient temperature 100 90 80 Number (F) of hours 100 500 1200 Cooling load Cooling load (Btu/hr) 36,000 24,000 12,000 Compressor power at capacity (kW) 5.8 5.5 5.2 Air-conditioner capacity (Btu/hr) 37,000 39,000 41,000