Posted by **Need Help ASAP** on Wednesday, May 15, 2013 at 1:21pm.

Jemima is sanding some floorboards with an electric sander which has a power rating of 360W. Jemima has the sander on for 45 minutes. The Sander is only 55% efficient. The electricity supplier charges 14.8p per kWh. What will be the cost of the 'wasted' energy?

I know how to work out the total cost but not the wasted energy cost...

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