Consider the following expected returns, volatilities, and correlations:

$\backslash$table$[[,\backslash$table$[[$Expected$],[$Return$]],\backslash$table$[[$Standard$],[$Deviation$]],\backslash$table$[[$Correlation$],[$with$],[$Microsoft$]],\backslash$table$[[$Correlation$],[$with$],[$Wal$-$Mart$]]],[$Stock$,47\%,24\%,1\mathrm{.}0,0\mathrm{.}7],[$Microsoft$,23\%,14\%,0\mathrm{.}7,1\mathrm{.}0]]$

a$.$ Calculate the expected return of a portfolio that is $60\%$ invested in Microsoft and $40\%$ in Wal$-$Mart.

b$.$ Calculate the volatility of the portfolio built in a$)$