Question

The internal measures of a cuboidal room are 10m x 8m x 5 m .Find the total cost of white washing all the four walls ,if the cost of white washing is Rs 20 per square metre.
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Answer 1

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Answer:

3600 Rupees

Step-by-step explanation:

In your given Question

if,

length=10m

breadth=8m

hieght=5m

and rate of white washing per square metre is Rs 20

area of four cuboidal walls = curved surface area

and curved surface area = 2×(length + breadth)× hieght

now,

= 2×(10 + 8) ×5

= 2×18×5

= 2×90

= 180square metre

if the cost of white washing of 1 metre square is Rs 20

so,

180 metre square is 180×20

= 3600 Rupees