Afarmer requires two rectangular corrals with a combined area of 200m^2. The cost of the fencing facing the road is $25/m while the sides cost $20/m. The back side of the corrals will be against the side of the barn, which is 40m long. what is the minimum cost?

We don't just do your homework or assignment for you.

You have posted 4 max/min problems without showing any steps or work or indicating where you difficulties lie.

I have done two of them for you.
Please show some work or steps before I do any more of them