The following particulars relate to ZPCL at the end of $2010$:

For its investment requirement at a project, the management of ZPCL finalized the following financial structure.

$($i$)$ Rs$.500,000$ equity shares of Rs$.10$ each. Present dividend per share is Rs$.15$; Market price Rs$.100$ per share. Growth rate in dividend $5$ per cent.

$($ii$)$ Retained earnings $$ Rs$.200,000.$

$($iii$)8\%$ Rs$.500,000$ preference shares of Rs$.50$ each issued at a discount of $5\%$ redeemable at the end of $5$ years.

$($iv$)$ Debentures of Rs$.1,000$ each, repayable at par in $2012,$ were issued as follows:

Type A: $200$ Type A debenture of $13$ per cent issued at a premium of $10$ per cent.

Type B: $100$ Type B debentures of $10$ per cent issued at a premium of $10$ per cent.

$($v$)11\%$ term$-$loan of Rs$.500,000$ for a period of $5$ years. ABC Ltd$.$ received the entire proceeds of the loan.

Assuming that Company is in a $50$ per cent tax bracket and that it uses book values as weights, calculate the overall cost of capital of ZPCL$.$