A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
-
N4.80
- N48.00
- N480.00
- N4800.00
The correct answer is: A
Explanation
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