You recently purchased a share of Yellow Submarine stock that is expected to earn 15 percent in a booming economy, 10 percent in a normal economy, and 1 percent in a recessionary economy. There is a 10 percent probability of a boom, 70 percent chance of a normal economy and a 20 percent chance of a recession. The Risk-free rate is 2.5%

What is your expected rate of return on this stock? What is the Standard Deviation? What is the Sharpe Ratio?

Please do step by step in excel, Thank you