Explanation:
On the client's portfolio (total investment = 120 K + 80 K = 200 K,
= (12.4 %risk premium + 5.4 %risk free return) [tex]\times[/tex] (120 K / 200 K) + 5.4 % [tex]\times[/tex] (80 K / 200 K)
= 17.8 % [tex]\times[/tex] 0.6 + 5.4 % [tex]\times[/tex] 0.4
= 12.84 %.
= 22.8 %.