# Chapter 19 - Exercises and Problems - Page 350: 35

$67.65 #### Work Step by Step We first find the efficiency:$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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