Q4. Zaid retired from his firm. He has continued to hold his private retirement investments in a portfolio of common stocks and bonds. At the beginning of 2019, when he retired, his account was valued at SAR 453,000.By the end of 2019, the value of his account was SAR 523,500. Zaid made no contributions to or withdrawals from the portfolio during 2019. What rate of return did Zaid earn on his portfolio during 2019? (2.5 Marks)