Question

A godown is 50 m long, 40 m broad and 10 m high. Find the cost of whitewashing its four walls and ceiling at Rs 20 per square metre.

Answer 1

Given:
Length = 50 m
Breadth = 40 m
Height = 10 m

Area of the four walls = {2h(l + b)} sq. unit
= {2 $\times$ 10 $\times$ (50 + 40)}m²
= {20 $\times$ 90} m² = 1800 m²
Area of the ceiling = l $\times$ b = (50 m $\times$ 40 m) = 2000 m²
∴ Total area to be white washed = (1800 + 2000) m² = 3800 m²
Rate of white washing = Rs 20/sq. metre
∴ Total cost of white washing = Rs (3800 $\times$ 20) = Rs 76000