Cost of Fencing for Parking Lot: Function of Width w | Tricky Word Problem

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The discussion focuses on calculating the cost of fencing for a rectangular parking lot, where the street-facing side is more expensive. The cost per meter for the back side is $10, while the street side costs double. The length of the street side is 20 meters longer than the width. Participants are attempting to express the total cost C as a function of the width w. The proposed formulas indicate different approaches to solving the problem, highlighting the complexity of the calculations involved.
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Fencing around a rectangular parking lot costs twice as much along the side facing the street than the other three sides. The fencing along the back of the lot costs $10 per meter. Express the cost C of the fence as a function of the width w if the length of the street side of the parking lot is 20m longer than the width.

Here is the best I could come up with..

C(w)=(3w+2/3w)$10+(w+2/3w)$20

How does that look?
 
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2nd attempt..

C(w)=$10/m(5w+60m)
 

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