WINSON HOLDINGS has RM$30$ million expansion in net assets during the coming year. Based on the debt asset ratio of $40\%($considered to be optimal$),$ earnings after taxes of $$60$ million, and a dividend payout policy of $80\%,$ you need to assist the company on how much external equity must the company seek. Discuss why do dividend policy and external financing can affect the financial structure of business organisations.

$($Please provide written calculations $)$