marie replaces an old microwave (microwave A) with a newer microwave (microwave B). The table below shows the power rating of each microwave and the number of hours Marie uses each microwave every night. Take the cost of electricity to be $0.30 per kWh in a month to consist of 30 days.What is the cost of using microwave A in a month
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Microwave ovens typically use about 1.5 kW (the Watt rating is the output, not the input). So 1 minute at full power is about 0.05 kWh.
How much does your kWh cost? Costs range between US $0.09 and US $0.90 per kWh. Where I live it’s round $0.25, and so the minute running would cost $0.0125 or so.
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