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The question asks us to calculate the gain (in ₹) for a seller who sold 19 cookies for ₹95 instead of the correct amount of 20 cookies per kg, and who originally bought the cookies for ₹76.

### Step-by-step solution:

1. **Cost per cookie (Correct scenario, 20 cookies):**
   - If the seller sells 20 cookies for ₹95, the selling price of 1 cookie would be:
   \[
   \text{Selling price per cookie} = \frac{95}{20} = 4.75 \text{ ₹ per cookie}.
   \]

2. **Actual selling price (19 cookies scenario):**
   - In the cheating case, the seller sold 19 cookies for ₹95, so the selling price per cookie is:
   \[
   \text{Selling price per cookie (cheating)} = \frac{95}{19} = 5 \text{ ₹ per cookie}.
   \]

3. **Cost price per cookie:**
   - The total cost price for 1 kg (20 cookies) is ₹76. So, the cost price per cookie is:
   \[
   \text{Cost price per cookie} = \frac{76}{20} = 3.8 \text{ ₹ per cookie}.
   \]

4. **Profit per cookie:**
   - The profit per cookie (in the cheating scenario) is the difference between the selling price and the cost price:
   \[
   \text{Profit per cookie} = 5 - 3.8 = 1.2 \text{ ₹ per cookie}.
   \]

5. **Total profit (for 19 cookies):**
   - Since the seller sold 19 cookies, the total gain is:
   \[
   \text{Total gain} = 19 \times 1.2 = 22.8 \text{ ₹}.
   \]

Thus, the seller's total gain is **₹22.8**, which matches option **C**.

Would you like any further clarifications?

### Related Questions:
1. What would the gain be if the seller sold 18 cookies for ₹95?
2. How would the profit change if the cost price increased to ₹80 for 20 cookies?
3. What would be the selling price per cookie if the seller sold 21 cookies instead of 20?
4. If the seller gave a discount of 5%, what would the new profit be?
5. How much should the seller charge for 20 cookies to make a 30% profit?

### Tip:
In such word problems, breaking down the scenario into cost price, selling price, and profit per unit helps simplify the calculations.

A seller sold 19 cookies for ₹95 instead of 20 cookies in one kg, cheating a customer. What is the gain (in ₹) if the seller bought the cookies for ₹76?

Learn how to calculate the profit made by a seller who sold 19 cookies for ₹95 instead of 20, and bought the cookies for ₹76. The solution includes formulas for selling price, cost price, and profit per cookie. Suitable for students in Grades 9-10.

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