Question

the walls and ceiling of a room are to be plastered. The Length breadth and height of the room or 4.5 M, 3M and 350 CM respectively. Find the cost of plastering at the rate of Rupees 8 per metre square.

Answer 1

Answer:

Total cost of Plastering is Rs. 528

Step-by-step explanation:

Given: Dimensions of Room, Length = 4.5 m , Breadth = 3 m &

           Height = 350 cm. Cost of Plastering = Rs. 8 per $m^2$

To find: Total cost of Plastering

Length, l = 4.5 m

Breadth, b = 3 m

Height, h = 350 cm = 3.5 m

Area of Plastering = Area of 4 walls + Area of ceiling

               = Curved Surface Area of Cuboid + Area of rectangle

                              = 2 × h × ( l + b ) + l × b

                              = 2 × 3.5 × ( 4.5 + 3 ) + 4.5 × 3

                              = 7 × ( 7.5 ) + 13.5

                              = 52.5 + 13.5

                              = 66 $m^2$

Total cost of Plastering = 66 × 8

                                       = Rs. 528

Therefore, Total cost of Plastering is Rs. 528

Answer 2

Step-by-step explanation:

without lid of cuboid=lb +2(lh+bh)

=(5×4)+ 2(5×3+4×3)

=20 + 2(15+12)

=20 +2(27)

=20+54

74sq.m

cost of plastering =74×10

=rs.740

HOPE IT HELPS YOU........