You would like to estimate the weighted average cost of capital for a new airline business. Based on its industry asset$$ beta, you have already estimated an unlevered cost of capital for the firm of $8\%.$However$,$ the new business will be $21\%$ debt$$ financed, and you anticipate its debt cost of capital will be $5\%.$ If its corporate tax rate is $30\%,$ what is your estimate of its$$ WACC? The equity cost of capital is