You hear on the news that the S&P$/$TSX Composite Index was down $1\mathrm{.}9\%$ today $($the market's return was $-1\mathrm{.}9\%).$ You

are thinking about your portfolio and your investments in BlackBerry and Air Canada.

a$.$ If BlackBerry's beta is $1\mathrm{.}3,$ what is your best guess as to BlackBerry's return today?

b$.$ If Air Canada's beta is $0\mathrm{.}5,$ what is your best guess as to Air Canada's return today?

a$.$ If BlackBerry's beta is $1\mathrm{.}3,$ what is your best guess as to BlackBerry's return today?

BlackBerry's return today is

$\%.($Round to one decimal place.$)$