please link an excel speeadsheet

Consider a risky fund with 18% standard deviation and 15% expected return and a risk free rate assets with 5% rate of return.

a. Write the Capital Allocation Line equation.

b. Using the fund and the risk free asset, design two portfolios; first one with 11% standard deviation, second with 22% standard deviation (calculate the fund and the risk free assets weights) and report the portfolio expected return.