a classroom is 8 m long,7 m broad,4.5m high. Doors and windows occupy an area of 18 square metre. Find the cost of whitewashing the walls at the rate of 2.50per sq.metre.
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Step-by-step explanation:
a classroom is in a cuboidal shape.
length = 8 m
breadth = 7 m
height = 4.5m .
To find the cost of whitewashing the walls. First we have to find out the lateral surface area of cuboid.
Lateral surface area of cuboid = 2h (l +b )
= 2 × 4.5 ( 8 + 7 )
= 9 (15)
= 135² m
The cost 1 sq.m is Rs. 2.50
the cost of whitewashing the walls= 2.50 × 135
= Rs. 337.50
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