Question

A room is 9 m long, 6 m wide and 4 m high. Find the cost of plastering its walls and ceiling at the rate of

Rs.2.50 per square metre.​

Answer 1

Answer:

Cost = Rs. 60

Step-by-step explanation:

Length = 9m

Width = 6m

Height = 4m

Surface area of walls = Lateral surface area

Surface area of walls = 2h(l + w).

                                    = 2 x 4(9 + 6)

                                    = 8(15) = 120m^2

Surface areas of ceiling = 2(l+w)

                                        = 2 (9+6) = 30m^2

Total Area needed to be plastered = 120  + 30 = 150m^2

Total Cost = Area/cost per meter = 150/2.50 = 60