Following information is available about Riana company:

Cost of debt
After-tax cost of debt	4.90%
Cost of equity
Treasury bond rate (risk free rate)	4%
Beta	0.62
Risk premium	8%

	2014	2015	2016	2017
Capital structure
% net debt	25.0%	25.5%	26.0%	26.5%
% equity	75.0%	74.5%	74.0%	73.5%

Required

1. Calculate cost of debt (before tax) each of the year from 2014 to 2017

2. Calculate cost of Equity each of the year from 2014 to 2017

3. WACC (Weighted average cost of capital)