Five 80-W and three 100W are run for 8 hours. If the cost of energy is N5.00 per unit, calculate the cost of running the lamp. [1 unit = 1 kWh]
- N280.00
-
N28.00
- N7.20
- N1.44
The correct answer is: B
Explanation
P = (80 x 5 + 100 x 3)8= 5600W
Cost = \(\frac{5600}{1000} \times 5 = N28\)