You hear on the news that the S\&P/TSX Composite Index was down 2.1% today (the market's return was 2.1% ). You are thinking about your portfolio and your investments in BlackBerry and Air Canada. a. If BlackBerry's beta is 1.4, what is your best guess as to BlackBerry's return today? b. If Air Canada's beta is 0.5 , what is your best guess as to Air Canada's return today? a. If BlackBerry's beta is 1.4 , what is your best guess as to BlackBerry's return today? BlackBerry's return today is %. (Round to one decimal place.)