Question

A door 2m by 1 m is fitted in the wall of a room .The length and breadth of the wall are 5.4 and 3.2 respectively.Find the cost of painting the wall from outside only at the rate of rupees 150per square meter​

Answer 1

Answer:

Area of rectangular door=length×breadth=2m×1m=2m

2

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

2

Now, Area of wall excluding door

=Area of wall including door−Area of door

=16.2−2=14.2m

2

Since, The rate of white washing of 1m

2

the wall=Rs. 20

Therefore, the rate of white washing of 14.2m

2

the wall=20×14.2

=Rs. 284

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

hope this will help you