Find the cost of running 60 W lamps and six 40 W tubelight for six hours
if electrical energy cost Rs 2.50 per unit.
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Answer:
Rs 4.5
Explanation:
Total wattage rate = 60 + 6(40) = 60 + 240 = 300w
Total watts used in 6 hours = 6 * (300) = 1800w = 1.8Kw
1 Unit = 1Kw
Cost of electrical energy = 2.5 * 1.8 = 4.5
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