Question

A room is 8.5m long 6.5m broad and 3.4m high. It has two doors each measuring (1.5m by 1m) and two window each measuring (2m by 1m).find the cost of painting its fours walls at Rs 160 per m^2.

Answer 1

net area of the four walls that has to be paint
= 2(8.5×3.4) + 2(6.5×3.4) - 2(1.5×1) - 2(2×1)
=57.8 + 44.2 -3 -4
=95 m^2
hence the cost of painting = 95×160
=Rs 15200.

I hope this helps you...