The leadership at DurableEarth Inc. $($DEI$)$ seeks to determine the cost of capital linked to their business expansion. They have indicated that they intend to secure funds according to a target capital structure based on the market value of their securities$.$ Below are the various sources of finance used by DEI per their balance sheet, as at $30$ June $2023.$

Bank Overdraft with a book value of $$7,368$ million, Bonds with a book value of $$20,000$ million, Preference shares $(8\mathrm{.}5\%)$ with a book value of $$2,000$ million, and ordinary shares $($issued and paid up$,12,500,000$ at $50$cents$)$ with a book value of $$6,250$million.

DEI's financial manager also has the following information:

The interest rate on the bank overdraft is $9\mathrm{.}5$ per cent per annum, compounded semi$-$annually. There are $200$ bonds, each with a face value of $$100,000$ and a coupon rate of $10\mathrm{.}5$ per cent per annum, payable on $30$ June and $31$ December each year. The bonds will be redeemed at their face value on $30$ June $2027.$ On $30$ June $2023,$ the market yield is $9\mathrm{.}5$ per cent per annum, compounded semi$-$annually. A coupon payment has just been paid. The preference shares have a face value of $$2$ and pay a dividend rate of $8\mathrm{.}5$ per cent per annum. Dividends are payable on $30$ June each year. On $30$ June $2023,$ the market price of each preference share was $$1\mathrm{.}55.$ A dividend has just been paid. DEI pays dividends on its ordinary shares once per year on $30$ June. The last dividend, which has just been paid, was $17\mathrm{.}5$ cents. Analysts predict that the long$-$term growth rate is $8\mathrm{.}0$ per cent per annum. On $30$ June $2023,$ the market price of each ordinary share was $$4\mathrm{.}25.$

With the above information, could you please answer the following questions with answers? On $30$ June $2023$:

$1.$ What is DEI's pre$-$tax cost of debt on the bank overdraft?

$2.$ What is DEI's pre$-$tax cost of debt on the bonds?

$3.$ What is DEI's market value of bonds?

$4.$ What is DEI's cost of preference shares?

$5.$ What is DEI's market value of preference shares?

$6.$ What is DEI's cost of ordinary shares?

$7.$ What is DEI's market value of ordinary shares?

$8.$ What is DEI's after$-$tax cost of capital?