A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?
- N90
- N50
-
N45
- N5
The correct answer is: C
Explanation
P = 40 x 10 + 100 x 5P = 400 + 500 = 900W
Cost = \(\frac{900 \times 10 \times 5}{1000}\)
Cost = N45
There is an explanation video available .