A company has $$50$ million in common stock, $$10$ million in preferred stock, and $$20$ million in outstanding bonds. What is the percentage of debt in this firm's capital structure?

Enter your answer as a percentage, without the percentage sign $(\text{'}\%\text{'}),$ rounded to $1$ decimal. For example, if your answer is $0\mathrm{.}0789,$ that's $7\mathrm{.}9\%,$ so just enter $7\mathrm{.}9$