Hello, I'm having trouble figuring this out and cannot figure the formula out. Can you help me understand this and show me how you come to the conclusion?

Thames Inc.'s most recent dividend was $2.6 per share (D₀ = $2.6).The dividend is expected to grow at a rate of 5% per year.The risk-free rate is 4% and the return on the market is 10%.The company's beta is 1.5

What is the required rate of return on the stock, k_s?