A house has ten 40W and five 100W bulbs How muc... - JAMB Physics 2013 Question
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 option: c
P = 40 x 10 + 100 x 5
P = 400 + 500 = 900W
Cost = \(\frac{900 \times 10 \times 5}{1000}\)
Cost = N45
P = 400 + 500 = 900W
Cost = \(\frac{900 \times 10 \times 5}{1000}\)
Cost = N45
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