A door of length 2 metre and breadth 1 metre is fitted in a wall. the length of the wall is 4.5 m and the breadth is 3.6 metre. Find the cost of whitewashing the wall, if the rate of whitewashing the wall is Rs. 20 per m square
Answers
The cost of whitewashing is ₹284.
• Given data :
The length of the door is 2 metres.
The breadth of the door is 1 metre.
The length of the wall is 4.5 metres.
The width of the wall is 3.6 metres.
Cost of whitewashing is rupees 20 per square metre.
• First,we have to calculate the area of the door by using the following mathematical formula :
= (Length of the door × Width of the door)
= ( 2×1)
= 2 metre²
• Now, we have to calculate the area of the world by using the following mathematical formula :
= Length of the wall × Breadth off the wall
= 4.5×3.6
= 16.2 metre²
• Now,the total wall area for the whitewashing is
= The area of the wall - The area of the door
= 16.2-2
= 14.2 metre²
• Now,the cost of the whitewashing will be
= Total area for whitewashing × Cost per metre square
= 14.2 × 20
= ₹284
So,the total cost of whitewashing is ₹284. (Answer)