please help me understand this question step-by-step. Thank you for your time.

You have $58,000. You put 19% of your money in a stock with an expected return of 12%,$36,000 in a stock with an expected return of 17%, and the rest in a stock with an expected return of 20%. What is the expected return of your portfolio? The expected return of your portfolio is \%. (Round to two decimal places.)