Stock A has an expected return of 15% and a beta of 1.2. T-bills are promising a 5% rate of return. You want to construct a portfolio of the stock and the T-bills that has an expected return of 12%. How much of your money as a percent must you put in Stock A to give you this expected return?

a. 60%

b. 30%

c. 50%

d. 40%

e. 70%