vertical parabolic curve has its PVI at station 29 + 25.00 and elevation 87.52. The grade of the back tangent is 2.5 percent, the grade of the forward tangent is -4.5 percent, and the curve length is 550 ft. Set up a table showing curve elevations at the PVC, at the PVT, and at half-station points along the curve. Compute the station and elevation of the curve turning point