Question

R S Aggarwal exercise 20B class 7

Answer 1

Answer:

Rs. 65,500

Step-by-step explanation:

Let PQRS be the given grassy plot  and ABCD be the inside boundary of the path

Length = 75 m

Breadth = 60 m

Area of the plot = ( 75 × 60 ) m²

                           = 4500 m²

Width of the path = 2 m

∴ AB = ( 75 - 2×2 )m

          = ( 75 -4 ) m

         = 71 m

AD = ( 60 - 2×2 )  

      = ( 60 - 4 )

      = 56 m

Area of rectangle ABCD = ( 71 ×  56 )

                                            = 3976 m²

Area of path =( Area of PQRS - Area of ABCD )

                      = 4500 - 3976

                      = 524 m²

Rate of constructing the path = Rs 125 per m²

∴ Total cost of constructing the path = 524 × 125

                                                                = Rs .65, 500