question about actuarial models for financial economy

Only two risky assets X and Y and a risk-free asset F are being traded in the market. Asset X Y F Return Rx Ry RF 8% Expected return 10% 11% Variance of return 2.5% 3.6% The covariance between Rx and Ry is 0.9%. Vayne has $15000 and she wants to invest all her money in an efficient portfolio with minimum variance. Find the expected return of this portfolio