Question

Rooms of 11 m long 8 metre wide 5 metre height find the cost of semantic it's four walls and floor at the rate of 4 per metre square including doors and windows

Answer 1

given,
l=11
b=8
h=5

now,
area of the four walls and floor=csa of room +area of floor

=(2(l+b)×h) + (l×b)

=(2(11+8)×5) + (11×8)

=(2(18)×5) + 88

=(180+88)

=268m2
now,
cost of semanting of 1 m2 = 4
cost of semanting 268m2= 4×268
= 1072