Explanation:

- The selling price of the book is given as Rs 453.60 after a 19% discount.

- To find the marked price, we need to consider the discount formula:

\( \text{Selling Price} = \text{Marked Price} \times (1 - \text{Discount Rate}) \).

- Substitute the given values: \( 453.60 = \text{Marked Price} \times (1 - 0.19) \).

- Simplify: \( 453.60 = \text{Marked Price} \times 0.81 \).

- Solve for Marked Price:

\( \text{Marked Price} = \frac{453.60}{0.81} \approx Rs 560 \).

- Option 1: 690 - This is incorrect. It's higher than the calculated marked price.

- Option 2: 490 - This is incorrect. It's lower than the calculated marked price.

- Option 3: 520 - This is incorrect. It's lower than the calculated marked price.

- Option 4: 560 - This is correct. It matches the calculated marked price.