An equal tangent sag vertical curve has an initial grade of $-2\mathrm{.}5\%.$ It is known that the final grade is positive and that the low point is at elevation $270ft$ and station $141+00.$ The PVT of the curve is at elevation $274ft$ and the design speed of the curve is $35m\frac{i}{h}r.$ Determine the station and elevation of the PVC and PVI. $($The other chegg responses are wrong,k for this is $49$ and L is not $0)$