Answer to Question #277163 in Financial Math for KAD

Question #277163

The PA system at North High School requires 400 watts it is switched on. How much would it cost to run 3 hours, at a cost of $0.10 per kilowatt hour? Round to the nearest cent.

Expert's answer

Convert 400 watts into kilowatts"=400\/1000=0.4kw"

"Cost=0.4\\times 3\\times0.10=0.12\\$"

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