ssume that you hold a well-diversified portfolio that has an expected return of 12.0% and a beta of 1.20. You are in the process of buying 100 shares of Alpha Corp at $10 a share and adding it to your portfolio. ($1,000)

Alphahasanexpectedreturnof15.0%andabetaof2.00. Thetotalvalueofyourcurrentportfoliois$9,000.

What will the expected return and beta on the portfolio be after the purchase of the Alpha stock?

please write with details and formulas, i need the formulas also