Five 100 - watt bulbs are put on for 45 days during which the home - owner is on vacation. If \(1 KW\) - hour of electricity costs \(\# 7.50\), how much does it cost the home owner?
A. # \(168.75\) B. # \(90.00\) C. # \(4050.00\) D. # \(810.00\)
Correct Answer: C
Explanation
Total power consumed \(=5(100 W )=500 W\) \(=(500 / 1000) KW\) \(=0.5 W\) Time \(=45\) days \(=(45 \times 24)\) hours \(=1080\) hrs Total quantity of electricity consumed \(=(0.5 \times 1080)\) hour \(=540 KWh\). Since \(1 KWh =\# 7.5,540 KWh\) \(=(540 \times 7.5)\) \(=\# 4050.00\)
