Question

a room is 6 m long 5m wide and 4 m high. the doors and windows in the room occupy 4 square metres of space find the cost of papering the remaining portion of the walls with paper 75cm wide at the rate of 2.40 per metre​

Answer 1

Answer: Rs 460.80

Explanation:

AREA OF ROOM

=2*(6*5)+2*(5*4)+2*(4*6) =60+40+49

=148M^2

WALL TO BE PAPERED

=(148 - 4) = 144M^2

PAPER TO BE USED=14400/75

= 192 PAPERS

COST= 192 x 2.40 = 460.8 RS

Answer 2

273.6

Explanation:

Surface area of the room

= 2(lb+bh+oh)

= 2(5*4+6*4+6*5)

= 2(20+24+30)

= 2*74

= 148 m^2

Area of door= 4m2

Remaining area = 148-4

= 114 m^2

Cost for 1m square= 2.40

Cost for 114m square= 2.40*114

= 273.6