a room is 9.5m long 7.5m broad and 2.5m high it has one door of dimensions 2m *3m and two windows each of the dimensions 3.5 *2m.find the cost of painting the four walls at RS 5.60 per square metre.
Answers
Area of four walls= 2(9.5+7.5)*2.5
Area of four walls=5*17=85m²
Area of doar =2*3=6m²
Area of two windows =2(3.5*2)= 2*7=14m²
AREA of walls for painting=85-6-14=65m²
Cost of painting =65*5.60=rs364
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Cost of painting the 4 walls = Rs 364
Solution:
Length of the room = 9.5 m
Breadth of the room = 7.5 m
Height of the room = 2.5 m
Surface area of the room = 2(length + breadth) × height
= 2(9.5 + 7.5) × 2.5
= 2(17) × 2.5
= 85
Surface area of the room = 85 m²
Area of the door = 2 m × 3 m
Area of the door = 6 m²
Area of the window = 3.5 × 2 m
= 7 m²
Area of 2 windows = 7 m² × 2
Area of 2 windows = 14 m²
Area of painting = 85 m² – 6 m² – 14 m²
= 65 m²
Cost of painting per m² = Rs 5.60
Cost of painting for 65 m² = 5.60 × 65
= 364
Hence cost of painting the 4 walls = Rs 364
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