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Preston's clock produces 45 useful energy units for every 100 units of electricity used. What is the efficiency of the clock?
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Preston's clock produces 45 useful energy units for every 100 units of electricity used. What is the efficiency of the clock?

User Mystic Cola
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This is my answer hope it helps
Preston's clock produces 45 useful energy units for every 100 units of electricity-example-1
User Jhnstn
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