Q. 8. A door of length and breadth is fitted in a wall. The length of the wall is and the breadth is (Fig11.6). Find the cost of white washing the wall, if the rate of white washing the wall is
It is given that the length of door is and breadth is and the length of the wall is and the breadth is
Now, we know that
Area of rectangle is
Thus, the area of the wall is
And
Area of the door is
Now, Area to be painted = Area of wall - Area of door = 16.2 - 2 = 14.2
Now, the cost of whitewashing the wall, at the rate of is
Therefore, the cost of whitewashing the wall, at the rate of is Rs 284