You own a stock portfolio invested $25$ percent in Stock Q$,20$ percent in Stock R$,40$ percent in Stock S$,$ and $15$ percent in Stock T$.$ The betas for these four stocks are $\mathrm{.}81,1\mathrm{.}19,1\mathrm{.}20,$ and $1\mathrm{.}37,$ respectively. What is the portfolio beta? $($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$