(Solved): You are designing a rectangular poster to contain 100 in. \( { }^{2} \) of printing with a 4-in. ma ...

You are designing a rectangular poster to contain 100 in. \( { }^{2} \) of printing with a 4-in. margin at the top and bottom and a 1-in. margin at each side. What overall dimensions will minimize the amount of paper used? What is the vertical height of the poster that will minimize the amount of paper used? \[ h=\text { in. } \]