#### Answer

$67.65

#### Work Step by Step

We first find the efficiency:
$e = \frac{1}{COP}=\frac{1}{3.4}=.294$
We multiply this by the monthly heating bill for the house. We call c the cost to obtain:
$c= .294 \times 230 = 67.65$

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Published by
Pearson

ISBN 10:
0-134-98855-8

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

$67.65

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