How do I calculate the expected return and risk for iii) and iv)?

4. The following are expected returns and risks of US and UK assets. US UK Expected return 10% 14% Risk 15% 20% (1) p=1 (ii) p = -1 (iii) p =.35 (iv) p=..55 a) Compute the expected return and risk of a portfolio made up of the following proportions of US and UK assets: US: 80%_60%, 45%, 25%, 15% UK: 20%._40%, 55%, 75%, 85% (try for 4 values of p; 5 combinations of US and UK)