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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?

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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