Problem $13-11$ Calculating Portfolio Betas $[$LO$4]$

You own a stock portfolio invested $25$ percent in Stock Q$,30$ percent in Stock R$,30$ percent in Stock S$,$ and $15$ percent in Stock T$.$ The betas for these four stocks are $\mathrm{.}75,1\mathrm{.}13,1\mathrm{.}14,$ and $1\mathrm{.}31,$ respectively. What is the portfolio beta? $($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$