Hampton Corporation has a beta of $1\mathrm{.}88$ and a marginal tax rate of $21\%.$ The expected return on the market is $10\%$ and the risk$-$free interest rate is $2\mathrm{.}39\%.$ Estimate the firm$$s cost of internal equity. SET YOUR CALCULATOR TO $4$ DECIMAL PLACES AND ROUND TO $2$ DECIMAL PLACES AT THE END. DO NOT ENTER THE $\%$ SIGN. IF YOUR ANSWER IS $7\mathrm{.}7000\%,$ FOR EXAMPLE, ENTER $7\mathrm{.}70.$