What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 Kobo per KWh? by Sunday | Mar 25 | Physics JAMB | 0 comments A. N0.65 B. N0.39 C. N3.90 D. N0.13 Correct Answer: Option D = N0.13 Users Also Read These:BY definition, variable cost (VC) is related to…What is the cost of running seven 40W lamps and five…A household refrigerator consumes electrical energy…A house has ten 40W and five 100W bulbs. How much…Three identical lamps each power 100W are connected…