Question

A door of length $2m$ and breadth $1m$ is fitted in a wall. The length of the wall is $4.5$ and the breadth is $3.6m$. Find the cost of the wall washing the wall, if the rate white washing the wall is $Rs.20$ per $m^2$

Answer 1

Given, length of door $=2m$

breadth of door $=1m$

Area of door $=2\times 1=2m^2$

and, length of wall $=4.5m$

breadth of wall $=3.6m$

Area of wall $=4.5\times 3.6=16.2m^2$

So , area of wall to wash $=16.2-2=14.2m^2$

So, the rate of white washing $=14.2\times 20=Rs284$