Cost of equity: SML$.$ Stan is expanding his business and will sell common stock for the needed funds. If the current risk$-$free rate is $2\mathrm{.}5\%$ and the expected market refurn is $10\mathrm{.}3\%,$ what is the cast of equity lor Stan it the beta of the stock is

a$.0\mathrm{.}64?$

b$.0,89?$

c$.1\mathrm{.}07?$

d$.1\mathrm{.}127$

a$.$ What is the cost of equity for Stan if the beta of the stock is $0\mathrm{.}64?$

$\%($Round to two decimal places.$)$