What would the equation be representing the area of the garden and how would you figure out the cost?

Jeff has 135 feet of horse fence that he going to use to build a garden on the side of his house. He wants to build the largest (bounded region) garden that the fence will enclose. What would the equation (representing the area of the garden) be to find the answer?

He will also need to purchase the following in order to plant his garden:
-Fence post: every 5 feet at $4.50 each
-Top soil: 3inches deep: each cubic yard cost $27
How would you find the cost?
To the guy who answered first- I'm still really confused on what the equation is.
where do you get 156?
 
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