2 Pizer is a large bcpany. Until now, Plizer has been completely equity financed Management feels that Pfizer is a maturing company with steady earnings, so they are considering adding debt to the capital structure. Specifically, Pfizer is considering issuing $10 billion in debt at 700 to finance share repurchases. Pfizer's market capitalization is $100 billion. There is no risk of bankruptcy. The company's marginal tax rate is 35%. a. Estimate the annual tax savings from debt. b. Assuming the company continues to have the same amount of debt forever, what is the present value of this tax shield