Problem 6 (10%) that Sears has an equity beta of 1.36, a debt beta of 0.17, and a debt-equity ratio of 0.20 while Saks had an equity beta of 1.85, a debt beta of 0.31, and a debt-equity ratio of 1.0. estimate the minimum NPV such that a new $1 million investment will benefit shareholders. Which firm has the more severe debt overhang problem? (2) Why should firms estimate the debt overhang problem? Why do you estimate the minimum NPV