A developer pay $$2,000,000$ to purchase a land to develop $40$ townhouses. The annual interest rate is $12\%$ on the funding financed the land, and the acquisition cost is $4\%$ of the land price. The whole development period $($from land acquisition to development disposal$)$ is $24$ months. $$ The construction cost of each townhouse is $$350,000.$ The Infrastructure Cost is $$100,000$ per townhouse. The consultants' cost is $$250,000,$ and the holding cost is $$80,000.$ The annual interest rate on capital financing the subtotal cost related to construction if is $12\%,$ and the construction period is $18$ month. $$ The price of each townhouse is $$650,000.$ Sales commission is $1\mathrm{.}3\%$ of the GRV$,$ the marketing cost is $$30,000.$ Other selling expenses $($legal fee$)$ is $$1050$ per townhouse. The developer needs to pay GST$.$ How much is the development profit$/$margin in dollar amount and percentage?