BEGIN {FS = "\t"
printf("%10s %6s %5s    %s\n\n","COUNTRY", "AREA", "POP", "CONTENENT")
      }
{ density=1000*$3/$2
 printf("%10s %6d %5d        %s \t density= %f\n", $1, $2, $3, $4, density)
  area=area+$2
  pop=pop+$3
  }

END { printf("\n%10s %6s %5d\n", "Total", area, pop) }