An electric bulb is rated at `200 V-100 W`. What is its resistance ? Five such bulbs burn for four hours. What is the electrical energy consumed ? Calculate the cost if the rate is `50` paise per unit.

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Calculate the Resistance of One Bulb
The power (P) of the bulb is given as 100 W, and the voltage (V) is 200 V. We can use the formula for power in terms of voltage and resistance:

\[ P = \frac{V^2}{R} \]
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