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]
A
N280.00
B
N28.00
C
N7.20
D
N1.44
Verified Correct Answer: B.
Physical Principles & Numerical Solution
P = (80 x 5 + 100 x 3)8
= 5600W
Cost = \(\frac{5600}{1000} \times 5 = N28\)
Source: Myschool Past Questions Archive (Record #34948)