Suppose a company that is currently all$-$equity and its shares have an expected return of $16,23\%.$ This firm undergoes a leveraged recapitalization, where it issues debt and repurchases stock until its debt$-$equity ratio is $0,42.$ Due to the increased risk, shareholders now expect a return of $14\%.$ Assuming there are no taxes and the firm's debt is risk$-$free, what is the interest rate on the debt?