A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
A
N4.80
B
N48.00
C
N480.00
D
N4800.00
Verified Correct Answer: A.
Physical Principles & Numerical Solution
Energy(kWhr) = 200 x 10\(^{-3}\) x 20 x 24
= 96kwhr
1 kwhr cost 5 kobo; 96 kwhr will cost
5 x 96 = 480 kobo
= N4.80
Source: Myschool Past Questions Archive (Record #28394)