You own a stock portfolio invested in $40$ percent in stock A and $60$ percent in Stock B$.$ The betas for these two stocks are $0\mathrm{.}5$ and $1\mathrm{.}0$ respectively. What i S the

portiolio beta?

$1\mathrm{.}5$

$0\mathrm{.}75$

$1\mathrm{.}0$

$0\mathrm{.}8$