Question

the floor of a rectangular hall has a perimeter of 250 m if the if its height is 6 m find the cost of painting its four walls at the rate of rupees 20 per metre square

Answer 1

Here, it's asked the cost of painting its four walls at the rate of ₹20 per m²

Hence, Total Cost = 20 × Area of 4 walls

=> Total cost = 20 × Lateral surface area.


So we will have to find the lateral surface area of the room.

Lateral surface area is given by :-

Perimeter of base × h

Given that perimeter = 250 m
height = 6 m

So lateral surface area = 250 × 6

=> Lateral surface area = 1500 m²


Now, total cost = 20 × lateral surface area

=> Total cost = 20 × 1500

=> Total cost = 30,000

Answer :- ₹30,000

Answer 2

$\bold \red {here \: is \: your \: answer}$
ANS: The perimeter of rectangular hall = 250m

The height of walls = 6m

Thus area of 4 walls is perimeter *height = 250*6 =1500m2

The cost of painting = Area in m2 * Rate of painting per m2

Thus, the Cost of painting 4 walls of the rectangular hall is 1500*20 = Rs 30000

$\boxed{thanks}$