Question

The floor of a rectangular hall has a perimeter 236m. Its height is 4.5m. Find the cost of painting its four walls (doors and windows be ignored) at the rate of₹8.40 per square meter

Answer 1

Answer:

Rs 8920.80

Step-by-step explanation:

Find the area of the 4 walls:

Area = Perimeter of the floor x height

Area = 236 x 4.5 = 1062 m²

Find the cost:

1 m² = Rs 8.40

1062 m² = 8.4 x 1062 = Rs 8920.80

Answer: Rs 8920.80

Answer 2

Question : The floor of a rectangular hall has a perimeter 236m. Its height is 4.5m. Find the cost of painting its four walls (doors and windows be ignored) at the rate of ₹ 8.40 per square meter ?

Method of Solution:

In this Question , It is  theoretically given that The floor of a rectangular hall has a perimeter 236m. Its height is 4.5m.

Now, Let the length, Breadth and it's Height be (l) metre , (B) metres and (h) metres respectively!

From Question, Given that : The floor of a rectangular hall has a perimeter 236m.

Perimeter of Floor = 2(Length × Breadth )

✏ 236 = 2(L +  B)

✏ 118 = l + B   -------(1)

According to the Question's Statement!

✒ Statement : Its height is 4.5m.

•°•.    [  Height of the Floor = 4.5 metres  ]

Using Curved Surface Area of Cuboid !

✏ Curved Surface Area of Cuboid (CSA) = 2(l+b)× h

✏ Curved Surface Area of Cuboid (CSA) = 2(118) × 4.5

✏ Curved Surface Area of Cuboid (CSA) = 1062 m²

Also , According to the Question's Statement!!

↪ Statement : Cost of painting at the rate of₹8.40 per m²

↪ Cost of painting 1 m² = ₹ 8.40

↪ Cost of painting 1062 m² = ₹ 8.40 × ₹ 1062

↪ Cost of painting 1062 m²  =  ₹   8920.80

     [     Hence, Required Cost  of painting its four walls (doors and windows be ignored) at the rate of₹ 8.40 per m² is ₹ 8920.80  ]