Question

a room is 7m long,7m wide and 3.5m high.find the cost of covering its wall with a wallpaper at the rate of Rs.3per m sq.

Answer 1

formula: 2h(l+b)
hence,
2*3.5*(7+7)=98

Answer 2

given
l=7m ,width =w =7m , h=3.5m
area of the wall paper required = 2(l+w)h

= 2(7+7)3.5
=2*14*3.5
=98 square meters
cost of 1 square meter wall paper =rs 3
cost of 98 square meters = 3× 98
=Rs 294