(b) Rs. 234
For fencing the rectangular field, we need to find the perimeter of the rectangle.
Length of the rectangle = 34m
Breadth of the rectangle​ = 18m
Perimeter of the rectangle = 2 (Length + Breadth)
= 2 (34 + 18) m
= 2 52 m = 104 m
Cost of fencing the field at the rate of Rs. 2.25 per meter = Rs. 104 2.25 = Rs. 234