Feedback for subjective question

Question 1: In the year ending January 2008, Wal-Mart paid out Rs.1,326 million as debt interest. How much more tax would Wal-Mart have paid if the firm had been entirely financed byequity. What would be the present value of Wal-Mart's interest tax shield if the companyplanned to keep its borrowing permanently at the 2008 level. Assume an interest rate of8% and a corporate tax rate of 35%.