Question

The floor of a rectangular hall has a perimeter 236 m its height is 4.5 m find the cast of painting its four wall at the rate of Rs 8.40 m per square metre

Answer 1

Given floor of rectangular hall = 236 m
That is 2(l + b) = 236 m
Height, h = 4.5 m
Area of four walls = 2h(l + b)
= 236 x 4.5
= 1062 sq m
Cost of painting four walls = Rs 8.40 x 1062 = Rs 8920.80

Answer 2

Answer:

The cost is Rs.8920.80.

Step-by-step explanation:

Given : The floor of a rectangular hall has a perimeter 236 m its height is 4.5m.

To find : The cost of painting its four wall at the rate of Rs 8.40 m per square meter.

Solution :

The perimeter of the floor of a rectangular hall is 236 m.

Formula of perimeter of a rectangle is

$P=2(l+b)$

$236=2(l+b)$

Height, h = 4.5 m

Area of four walls

$A=2h(l+b)$

$A=(4.5)(236)$

$A=1062m^2$

The cost of painting is at the rate of Rs 8.40 m per square meter.

Cost of painting four walls = Rs 8.40 x 1062 = Rs 8920.80.

Therefore, The cost is Rs.8920.80.