Hampton Corporation has a beta of $0\mathrm{.}8$ and a marginal tax rate of $21\%.$ The expected return on the market is $18\%$ and the risk$-$free interest rate is $4\mathrm{.}13\%.$ 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 $7\mathrm{.}70.$