Assume you are now at the beginning of the year 2022 and are trying to evaluate company GrowthClassic Incorporated using the discounted cash flow valuation model. The marginal corporate tax rate of GrowthClassic is 25%.

The credit rating of GrowthClassic is B+ and the average credit spread of debt with B+ credit rating and the same maturity is 2%. The risk-free rate for all the maturity is 3%. The Bloomberg adjusted beta for GrowthClassic at the end of the last year was 1.65. The expected return of the market portfolio is 8.20%. The current debt-to-equity ratio at the end of the last year was 0.5 and then changed to 1.4 at the beginning of this year. We assume that the changes in capital structure does not affect the firms credit rating nor business risk. Please base on the above information and calculate the cost of debt (Kd), cost of equity (Ke) and the weighted-average cost of capital (WACC) of the firm after the changes of capital structure.