Question

A door of length 2 m and breadth 1m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m. Find the cost of whitewashing the wall, if the rate of white washing the wall is Rs 260 per sq. m *

Answer 1

$\huge\bf{Solution:-}$

• $\huge\boxed{\fcolorbox{black}{white}{Area\: of\: rectangular\: door\: = \:Length \:x \:Breadth}}$

$2m \times 1m = {2m}^{2}$

Area of wall including door = length x breadth = 4.5 m x 3.6 m = 16.2m²

Area of wall including door – Area of door = 16.2 – 2 = 14.2 m²

Since,

The rate of white washing of 1 m² the = ` 20 Therefore, the rate of white washing of 14.2 m² the wall = 20 x 14.2 =Rs 284

Thus, the cost of white washing the wall excluding the door is Rs 284.

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