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An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours ...

An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?

A. N7.20
B. N18.00
C. 180.00
D. N720.00




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