James Brown Limited has one million ordinary shares in issue

James Brown Limited has one million ordinary shares in issue. It also has 500 000 preference shares in issue with a preference dividend of 6% on price and currently sells for R3 per share. In its capital structure, it has 200 bonds outstanding, with a coupon rate of 9%. The bonds have 10 years to maturity and the yield-to-maturity is 12% (YTM). The equity shares currently sell for R2 each and have a beta of 0.9. The market risk premium is 8%, T-bills are yielding 7%. James Brown's tax rate is 30%.
Calculate the weighted average cost of capital.