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. 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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5 years ago

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