### Home > PCT > Chapter Ch9 > Lesson 9.1.2 > Problem 9-28

9-28.

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.