Answer :

Here, Power of heater (P) = 500W = 0.5kW, Time(t) = 20hr

We know that

Energy consumed = P x t = 0.5 X 20

= 10kwh

Total cost = 10xcost per unit

Cost per unit = Rs. 3.9 per unit

Therefore, total cost = 10 x 3.9 = Rs 39

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