An electric heater is rated at 2kW. Electrical energy costs rupees 4 per kWh. What is the cost of using the heater for 3 hours? a) Rupees 12 b) Rupees 24 c) Rupees 36 Rupees 48

The correct option is b) Rupees 24.

It is given that the electrical energy cost is Rupees 4/kWh Time duration is 3 hours

The power of the electric heater is 2kW

Using the given information we can calculate the amount for 3 hours as Rupees 24.