PLEASE HELP HOW DO SOLVE THIS?

Next, compute portfolios that have the lowest standard deviation for a target level of the expected return.

a.Start by finding the portfolio with an expected return 2% higher than that of the minimum variance portfolio. To do this, add a constraint that the (annual) portfolio return equals this target level. Click Solve and record the standard deviation and mean return of the solution (and be sure the mean return equals targetif not, check your constraint).

b.Repeat step (a) raising the target return in 2% increments, recording the result for each step. Continue to increase the target return and record the result until Solver can no longer find a solution.

c.At what level does Solver fail to find a solution? Why?