Return on a Portfolio between, standard, expected, partially, following

anshultongia

I have two stocks - A and B. I know the following for each stock: expected return, standard deviation, and price per share. I also know the covariance between the two stocks.

How do I find the expected return and standard deviation of a portfolio that consists of 50 shares of stock A, partially financed by a short sale of 25 stocks of B?