Suppose you hold a portfolio consisting of a R 10 000 investment in each of 8 different ordinary shares. The portfolio's beta is 1.25 . You decide to sell one of your shares that has beta of 1.00 for R 10 000 and use the proceeds to purchase a replacement share with a beta of 1.35. What would the new portfolio's beta be ?

a)1.17

b)1.28

c)1.43

d)1.23

e)1.36