The correct answer is A. Rs 996,000,000.00.
To calculate total common equity, we multiply the number of common shares outstanding by the book value per share. In this case, we have 50,000,000 shares outstanding and a book value per share of Rs 19.92, so the total common equity is Rs 996,000,000.00.
Option B is incorrect because it is the book value per share multiplied by the number of common shares outstanding, but then it is rounded down to the nearest million. Option C is incorrect because it is the book value per share multiplied by the number of common shares outstanding, but then it is rounded down to the nearest hundred thousand. Option D is incorrect because it is the book value per share multiplied by the number of common shares outstanding, but then it is rounded down to the nearest ten thousand.