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9-28.
  1. An open box is constructed as shown below. The sides of the box are made out of sheet metal costing $1 per square foot while the bottom is made of a more expensive metal costing $3 per square foot. How much, in terms of x and h, will it cost to construct the box? Homework Help ✎

1. Find the surface area.
2. Sum up the cost of each part.