The table below shows the betas and portfolio weights for $3$ stocks:

$\backslash$table$[[,$Portfolio weights$],[$Stock$,$Beta,Portfolio $1,$Portfolio $2],[$A$,1\mathrm{.}9,0\mathrm{.}3,0\mathrm{.}1],[$B$,1\mathrm{.}1,0\mathrm{.}5,0\mathrm{.}4],[$C$,0\mathrm{.}3,0\mathrm{.}2,0\mathrm{.}5]]$

Calculate the beta of each portfolio.

Part $1$

Attempt $\frac{1}{10}$ for $10$ pts$.$

What is the beta of portfolio $1?$