You invested $14,000 in a portfolio with an expected return of 4.7 per cent and $24,000 in a portfolio with an expected return of 13.5 per cent. The expected return of the combined portfolio is (as a percentage to two decimal places eg 2.881% is 2.88)) O a. 5.20% O b. 11.49% O c. 10.26% O d. 7.92%