A fashion arbitrageur discovers a way to transport dresses from PleasantVille to HappyValley for $5 each, so

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Question:

A fashion arbitrageur discovers a way to transport dresses from PleasantVille to HappyValley for $5 each, so he plans to buy dresses in PleasantVille and ship them to HappyValley to sell. Upon discovering the fashion arbitrageur’s plan, the fashion retailer decides to eliminate the arbitrage opportunity by ensuring that its selling price in HappyValley is no more than $5 more than the selling price in Pleasantville (and vice versa).

What is the fashion retailer’s new selling price in each city?

What is the fashion retailer’s corresponding profit?