A sag curve and crest curve connect a 3.5% tangent section of highway (to the west) with a +2.5% tangent section of highway (to the east). The +2.5% tangent section is at a higher elevation than the 3.5% tangent section. The two tangent sections are separated by 1150 ft of horizontal distance. If the design speed of the curves is 50 mi/h, what is the common grade between the sag and crest curves (G2 of sag and G1 of crest, from west to east), and what is the elevation difference between the PVCs and PVTc?