Explanation:

To determine the shopkeeper's profit, follow these steps:

- Marked Price (MP): Rs 2,500

- Discount Offered: 10% of MP

$$\text{Discount}=\frac{10}{100}\times 2500=Rs250$$

- Selling Price (SP): MP minus Discount

$$\text{SP}=2500-250=Rs2,250$$

- Profit Percentage: 25%

This profit percentage is based on the cost price (CP).

- Determine Cost Price (CP):

Profit = Selling Price - Cost Price

Let CP be $x$.

$$\frac{25}{100}\times x=2250-x$$

Solving:

$$0.25x=2250-x$$

$$1.25x=2250$$

$$x=\frac{2250}{1.25}=Rs1,800$$

- Actual Profit:

$$\text{Profit}=2250-1800=Rs450$$

- Answer choice 1: Rs 450 is correct.

The correct answer is Option 1: Rs 450.

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