problem: Your portfolio consists of $100,000 invested in a stock which has a beta = 0.8, $150,000 invested in a stock which has a beta = 1.2, & $50,000 invested in a stock which has a beta = 1.8. The risk-free rate is 7%. Last year this portfolio had a required rate of return of 13%. This year nothing has changed except for the fact that the market risk premium has raised by 2% [two percentage points]. find out the portfolio's current required rate of return?