Stock R has a beta of $2\mathrm{.}1,$ Stock S has a beta of $0\mathrm{.}55,$ the required return on an average stock is $9\%,$ and the risk$-$free rate of return is $7\%.$ By how much does the required return on the riskier stock exceed the required return on the less risky stock? Round your answer to two decimal places and enter your answer here Blank $1\%$