An electric refrigerator rated `400 W` operates `8 hour//day`. What is the cost of the energy to operate it for `30` days at Rs. `3.00` per `kWh` ?

Explanation

To solve the problem, we need to calculate the total energy consumed by the refrigerator over 30 days and then find the cost based on the given rate. Here’s the step-by-step solution:

### Step 1: Calculate the daily energy consumption
The power rating of the refrigerator is given as 400 W (watts). It operates for 8 hours a day.

\[ \text{Daily Energy Consumption (in watt-hours)} = \text{Power (W)} \times \text{Time (h)} \]
...