Diamond Inc. has a beta of 0.98 and an expected dividend growth rate of 4.50% per year. The T-bill rate is 4.00%, and the T-bond rate is 5.52%. The annual return on the stock market during the past 4 years was 10.5%. Investors expect the average annual future return on the market to be 12.50%. Using the SML, what is the firm's required rate of return?