WACC

A firm has the following capital structure as the latest statement shows:

$\backslash$table$[[$Source of Fund,Rs$.,$After Tax Cost $\%],[$Debt$,3000000,4],[$Preference Shares,$1000000,8\mathrm{.}5],[$Equity Shares,$2000000,11\mathrm{.}5],[$Retained Earnings,$4000000,10],[$TOTAL$,10000000,]]$

Based on the book values, compute the cost of capital.