IMPORTANT: SHOW YOUR DETAILED SOLUTIONS FOR EACH QUESTION.

Explain what type of problem is it, explain which formula are you using, identify the variables in the formula and explain where are you finding the respective values, and solve the calculation.

4.- A stock has an expected return of 13.1 percent, a beta of 1.28, and the expected return on the market is 11 percent. What must the risk-free rate be?

please tell which buttons on excel file did you use progessively