question 17 & 18 with explanation please

Q17A portfolio worth $100,000 has $20,000 of Stock X, which has a beta of 1.8. The total portfolio's beta is 1.2. The portfolio manager replaces Stock X with Stock Z that has a beta of 1.3. The risk-free rate is 3% and expected return on the market is 11%. What is the expected return on the portfolio after replacing Stdck X with Stock Z? A) 9.6% iOV B) 11.8% C) 11.2% V D) 12.4% 1- 2= (, 2 ) (1-81+(,2)( (28600% WT STOCK x = b - 207. porT beta= 1.2 B= WiB,t.. 1.8 sTockZ be Ta = 1._ 1.2= 36t.2X Ecr)marlket= 1 (r) porT= Q18)A portfolio worth $100,000 has $20,000 of Stock X, which has a beta of 1.8. The total mPortfolio's beta is 1.2. The portfolio manager replaces Stock X with Stock Z that has a beta Pof 1.3. The risk-free rate is 3% and expected return on the market is 11%. What is the expected return on the portfolio after replacing Stock X with Stock Z? A) 9.6% B) 11.8% C) 11.2% D) 12.4% a E) 10.0% 3/.+(11/-31.)(1.4) E(r) port