What is the cost of running five 50W lamps and four 100W lamps for 10…

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
  • A.
    N0.65
  • B.
    N0.13
  • C.
    N3.90
  • D.
    N39.00
  • E.
    N234.00
Correct Answer: Option B
Explanation

PT = (5 x 50) + (100 x 4)
= 650watts
Energy(kWhr) = 650 x 10-3 x 10
= 6.5 kWhr
1kWhr cost 2 kobo ; 6.5 kWhr will cost (frac{2 times 6.5}{1})
= 13 kobo

You May Also Like