These questions are not related to each other. a. A stock has had returns of 5.6%,-9.3%, 3.5%, and 25.7% over the last four years. What is the geometric return for the stock? Please show your calculations. b. Habisa Ltd. has a target debt-equity ratio of 0.65. Its WACC is 10.3%, and the tax rate is 29.1%. If Habisa's cost of equity is 15%, what is its pre-tax cost of debt? Please show your calculations. C. What is the average return for Smell Island Corp.? Please show your calculations. Date Stock price 12/31/2016 60.33 12/31/2017 65.89 12/31/2018 59.57 12/31/2019 66.45 12/31/2020 74.29 12/31/2021 74.99 d. What is diversification? Please explain