find the cost of colouring the walls of a classroom 7m×6 .5m×4m if the charge per m^2 is rs.5.25 it has 1 door 3m×1.4 and 3 windows 2m×1m
Answers
Step-by-step explanation:
The cost of colouring the walls is ₹513.45
Answer:
The cost of colouring the walls of a classroom is Rs 513.45
Step-by-step explanation:
Length of classroom (l) = 7 m
Breadth of classroom (b) = 6.5 m
Height of classroom (h) = 4 m
Rate of colouring walls = Rs 5.25
★ Door's dimensions :
Length = 3 m
Breadth = 1.4 m
★ Window's dimensions :
Total number of windows = 3
Length = 2 m
Breadth = 1 m
Find the surface area of 4 walls = 2 (l + b) h
⇒ 2 (l + b) h
⇒ 2 (7 + 6.5) × 4
⇒ 108 m²
Area of door = length × breadth
⇒ 3 × 1.4
⇒ 4.2 m²
Area of 3 windows =
⇒ 3 (l × b)
⇒ 3 (2 × 1)
⇒ 6 m²
Area to be coloured = area of 4 walls - (area of door + area of 3 windows)
⇒ 108 m² - (4.2 m² + 6 m²)
⇒ 97.8 m²
The cost of colouring the walls =
Rate × Area
⇒ Rs 5.25 × 97.8
⇒ Rs 513.45
Therefore,
The cost of colouring the walls of a classroom is Rs 513.45