You invested $10,000 in a portfolio with an expected return of 4.6 per cent and $20,000 in a portfolio with an expected return of 9.0 per cent. The expected return of the combined portfolio is (as a percentage to two decimal places eg 2.881% is 2.88)) Select one: O a. 7.53% O b. 9.07% O c. 5.10% O d. 8.98%