Calculate the efficiency of this method of making cup of tea

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Reference no: EM13798802

To make tea Tom boiled some water in a kettle. The kettle used 320 000 J of energy. It took 80 000 J to boil the water to make his tea.
The rest of the energy was wasted. Calculate the efficiency of this method of making a cup of tea.

Reference no: EM13798802

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