A cubical open box of 1m to paint-with a per square meter cost of 20 rupees-will be costing ..............rupees
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9th
Maths
Surface Areas and Volumes
Surface Area of Cubes and Cuboids
An open box is made of 3cm ...
MATHS
An open box is made of 3cm thick. Its external length, breadth, and hights are 1.48 m, 1.16m, 8.3dm. Find the cost of painting the inner surface at 50 p per 100 cm
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ANSWER
Thickness of wood = 3 cm
External dimensions :
Length = 1.48 m = 148 cm
Breadth = 1.16 m = 116 cm
Height = 8.3 dm = 83 cm
Now,
Inner length = Outer length - twice width = 148 - 6= 142 cm
Breadth = 110 cm
Height = 80 cm [ since it is open box]
Area of inner surface = 2(lb+bh+hl)−lb
= 2[142×100+110×80+80×142]−[142×110] = 55940 sq. cm
Cost of painting inner surface = Rs.
100
50
×
100
55940
= Rs. 279.90