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1. If the electrical energy costs 8 Php per kilowatt-hour, how much does it cost to (a) burn a 250-W lightbulb for 28 h? (b)

1. If the electrical energy costs 8 Php per kilowatt-hour, how much does it cost to (a) burn a 250-W lightbulb for 28 h? (b) Operate an electric oven for 8.0 h if it carries a current of 21.0 A at 220 V

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