The ost of cultivating a square field at the rate of Rs. 160 per hectare is Rs 1440. Find the cost of putting a fence around it at the rate of 75 paise per meter.

given,

        cost of cultivating the field is rs.160 per hectare is 1440

      1 hectare  =   rs.160

       ?  (be x hecatres)           =   rs.1440

      x   = Rs.1440*1 hectare 

                 Rs.160

      x   = 9 hectares

    hence cost of Rs1440 is for 9 hectares of land

    now,

    s be the side of the square field

    area of the field =9hectares

     s² = 9*10000m²(but hectare is unit of area where 1hectare=10000m²)

      s²=90000m²

        s=300m

    side of square field is 300m

    fence is put along the perimeter of the field 

   perimeter of the field=4s

                                        =4*300

                                        =1200m

    cost of fencing=cost per meter * perimeter

                               =75 paise * 1200m

                               =90000paise

                          cost of fencing=90000paise 

                                               (or)

                           cost of fencing=90000/100(here 1 rupee is 100 paise so we divide the                                       derived amount by 100)                                                     

                                   =Rs.900

thank you, :D hope you understood