Let the sides of the triangle be 25x m, 17x m and 12x m.
We know:
Perimeter = Sum of all sides
or, 540 = 25x + 17x + 12x
or, 54x = 540
or, x = 10
Thus, we obtain the sides of the triangle.
2510 = 250 m
1710 = 170 m
1210 = 120 m
Now,
Cost of ploughing 10 m2 field = Rs 18.80
Cost of ploughing 1 m2 field = Rs
Cost of ploughing 9000 m2 field =