Answer:
a.
Excess return for Zynga today will be -3.38%
b.
Excess return on P&G today will be -1.04%
Explanation:
The excess return is the return earned above/beyond the benchmark return. This benchmark can be set at either the risk free rate or any other stock or portfolio's return.
The return on a stock is usually calculated using the CAPM equation. The CAPM considers risk free rate, the return on market and the stock's beta to calculate the expected return on a stock.
The market always has a beta of 1. Beta is the measure of the volatility of stock returns. If the excess return on the market falls or rises, the effect of this on a stock's excess return will be based on its beta.
a.
The excess return of Zynga today will be = -2.6% * 1.3 = -3.38%
b.
The excess return of P&G today will be = -2.6% * 0.4 = -1.04%