A vertical curve has the following properties:
I = 1200ft, G₁ = -4.1%, G₂ = +6.2%, and the PVI is at Sta. 37 + 50 and an elevation of 103.00ft. Determine the elevation of sag point.
a. 119.2ft
b. 117.8ft
c. 127.6ft
d. 121.6ft