You hear on the news that the​ S&P 500 was down 2.8% today relative to the​ risk-free rate​ (the market's excess return

[answerhappygod]

You hear on the news that the​ S&P 500 was down 2.8%
today relative to the​ risk-free rate​ (the market's
excess return was −2.8%). You are thinking about your portfolio and
your investments in Zynga and Proc and Gamble.
a.If​ Zynga's beta is 1.4​, what is your best guess as
to​ Zynga's excess return​ today?
b. If Proc and​ Gamble's beta is 0.5​, what is your
best guess as to​ P&G's excess return​ today?