The correct answer is A. Rs. 25,000.
Minority interest is the portion of the equity of a subsidiary that is not owned by the parent company. In this case, X Ltd owns 70% of Y Ltd, so the minority interest is 30%. The minority interest is calculated as follows:
Minority interest = Share capital of subsidiary * (1 – Ownership percentage)
= Rs. 70,000 * (1 – 0.7)
= Rs. 25,000
Option B is incorrect because it is the share capital of Y Ltd. Option C is incorrect because it is the purchase price of Y Ltd. Option D is incorrect because it is the total equity of Y Ltd.