Question

A room is 6.2 m long , 3.8 m wide and 3.2 m high . It has 2 doors each 2m × 1.2 m and 2 windows each 1.2 m × 1.5 m . Find the cost of white-washing it's wall at the rate of rs 10 per square meter

Answer 1

Here area of white washing =
$l \times b + \\ b \times h + h \times l - \\ (2 \times 2 \times 1.2 + 2 \times \\ 1.2 \times 1.5)$
After all calculations u will get area and then just multiple with 10 to get cost of white washing

Answer 2

area of 2 doors = 2×2×1.2 = 4.8m^2
area of 2windows = 2×1.2×1.5=3.6 m^2
area of four walls = 2(l+b)h
=2(6.2+3.8)×3.2
=64m^2
area for white washing= 64 - (4.8+3.6)
=55.6m^2
cost = 55.6×10 =556 rs