A tangent section of highway has a -1.0% grade and ends at station 4 + 75 and elevation 82 ft. It must be connected to another section of highway that has a -1.0% grade and that begins at station 44 + 12 and elevation 131.2 ft.
The connecting alignment should consist of a sag curve, constant-grade section, and crest curve, and be designed for a speed of 50 mi/h. What is the lowest grade possible for the constant-grade section that will complete this alignment?