Physics JAMB

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?
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?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?

A. N90
B. N50
C. N45
D. N5

Correct Answer:

Option C – N45

Explanation

P = 40 x 10 + 100 x 5

P = 400 + 500 = 900W

Cost = (900×10×5)/1000

Cost = N45

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