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Q.

If the perimeter of a room is 28 m and its height is 2.5 m, then the cost of white washing its walls at the rate of 5 per square meter is

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a

Rs.250 

b

Rs.350 

c

Rs.550 

d

Rs.450 

answer is B.

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Detailed Solution

 

Perimeter of room

p =28m

Height

h =2.5m

L.S.A.

h =?

L.S.A=p×h=28×2.5=70sq.cm

 

Cost of white washing

=70×5=Rs.350

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