Can someone show me how to calculate the following: risk-free rate of return that is 15.51% based on expected inflation premium of 2.54%. The expected return on the market is 12.8%. What is the required rate of return for common stock that has a beta of 1.35?

Can someone show me how to calculate the following: risk-free rate of return that is 15.51% based on expected inflation premium of 2.54%. The expected return on the market is 12.8%. What is the required rate of return for common stock that has a beta of 1.35?

Do you have a typo in your question?
How can the risk-free rate be 15.51% if the expected return on the market is 12.8%?
Herman