ou hear on the news that the Sap / TSX Composite Index was down 1 7 % today relative to the risk- free rate ( the market's excess return was - 1 7% ) . You are thinking a bout your portfolio and your investments in Research in Motion ( RIM and West Jet 7 If RIM's beta is 1 2 , what is your best guess as to RIM's excess return today ? b . If West Jet's beta is O. 4 what is your best guess as to West Jet's excess return today