Assume that the risk$-$free rate is $4\%$ and the expected return on the market is $11\mathrm{.}5\%.$ What is the expected rate of return on a stock with a beta of $0\mathrm{.}8?$

$15\mathrm{.}5\%$

$12\mathrm{.}40\%$

$10\mathrm{.}00\%$

$9\mathrm{.}20\%$