Question

A room is 10 m long, 6 m wide and 4.2 m high. It has one door of 2.5 m x 1.5 m and one window
of dimension 1.5 m * 1 m. Find the cost of whitewashing the walls at ₹2.50 per sq.m.​

Answer 1

Answer:

322.875 Rs

Explanation:

area of 4 walls in a room=2h(l+b)

=2×4.2(10+6)

=8.4×16

=134.4m²

area of a door=2.5×1.5

=3.75m²

area of a window=1.5m²

area for whitewashing the walls=area of room-area of window+area of door

=134.4-3.75+1.5

=134.4-5.25

=129.15m²

Total cost for whitewashing walls=area for whitewashing the walls×rate

=129.15×2.50

=322.875 Rs