1132.CBSE vii - cmputing Breadth of a room when painted area and area of window and doors is given

A Room has length of 12m and height of 9 m. It has two rectangular Doors of length 4 m and breadth 2 m respectively. Further, there is one window with an area of 6m square. If the cost of painting the walls of the Room is Rs. 3,020 at Rs. 10 per m square, find the Breadth of the Room ?