Hasan buys two kinds of cloth materials for school uniforms, shirt material that costs him₹50 per metre and trouser material that costs him ₹90 per metre. For every 3 metres of the shirt material he buys 2 metres of the trouser material. He sells the materials at 12% and 10% profit respectively. His total sale is ₹36,600. How much trouser material did he buy?
Note: Please guide me on selling price and percentage and others.