3410

3420

3430

3440

D. 3440

In this question, we are having perimeter.

We know Perimeter = 2(l+b), right

So,

2(l+b) = 340

As we have to make 1 meter boundary around this, so

Area of boundary = ((l+2)+(b+2)-lb)

= 2(l+b)+4 = 340+4 = 344

So required cost will be = 344 * 10 = 3440