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$.,3216.)$

Portfolio beta