You hear on the news that the S&P$/$TSX Composite Index was down $1\mathrm{.}8\%$ today $($the market's return was $-1\mathrm{.}8\%)$ You are thinking about your portfolio and your investments in BlackBerry and Air Canada.

a$.$ If BlackBerry's beta is $1\mathrm{.}2,$ what is your best guess as to BlackBerry's return today?

b$.$ If Air Canada's beta is $0\mathrm{.}4,$ what is your best guess as to Air Canada's return today?