#### Answer

25 MJ

#### Work Step by Step

The energy used is 10 MJ. However, the process of harvesting that energy at the power plant is only 40% efficient. Thus, we find:
$ E= \frac {10 MJ}{.4}=25 MJ$

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Published by
Pearson

ISBN 10:
0-134-98855-8

ISBN 13:
978-0-13498-855-9

25 MJ

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