NO.PZ2023112701000061
问题如下：
The cost of debt and equity is likely to be higher for a firm with
选项：
A.stable revenue growth.
B.high operating leverage.
C.high interest coverage.
解释：
Correct Answer: B
B is correct. Operating leverage is the firm’s proportion of fixed costs to total costs and measures the stability of profits. Firms with high operating leverage experience a greater change in operating profits for a given change in revenues. Thus, firms with high operating margins are riskier and likely to have higher debt and equity costs.
A and C are incorrect. Stable revenue growth and high interest coverage suggest a lower risk profile for the firm and a lower cost of debt and equity. A high interest coverage ratio indicates the firm has lower financial leverage and less risk.
如题，这个比率是怎么算的？