A house hold refrigerator is rated 200 watts. If electricity costs \(5 k\) per kwh, what is the cost of operating it for 20 days ____________
A. #4.80
B. \(\# 48.00\)
C. \(\# 480.00\)
D. \(\# 4800.00 \)
E. #240.00
Correct Answer: A
Explanation
Given: power \(P=200 W\)
$$
\begin{aligned}
&\text { Time }=20 \text { days }=20 \times 24=480 hr \\
&\text { Cost }=\frac{P \times t}{1000} \\
&\text { Cost }=\frac{5 \times 480 \times 200}{1000} ; \\
&\text { Cost }=480 K =\# 4.80 K
\end{aligned}
$$
