Answer:
11.77%
Step-by-step explanation:
total investment = $200,000 + $300,000 + $500,000 + $1,000,000 = $2,000,000
stock weight beta total
A $200,000 / $2,000,000 1.5 0.15
B $300,000 / $2,000,000 -0.5 -0.075
C $500,000 / $2,000,000 1.25 0.3125
D $1,000,000 / $2,000,000 0.75 0.375
Portfolio 0.7625
required rate of return = Rf + beta(Rm - Rf) = 7% + 0.7625(13.25% - 7%) = 11.7656% = 11.77%