You own a stock portfolio invested $15$ percent in Stock Q$,20$ percent in Stock R$,30$ percent in Stock S$,$ and $35$ percent in Stock T$.$ The betas for these four stocks are $\mathrm{.}79,1\mathrm{.}23,1\mathrm{.}13,$ and $1\mathrm{.}36,$ respectively. What is the portfolio beta?

Note: Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

Portfolio beta