Consider the diagram of the problem.
Let the vertex be on the y axis, exactly, at the point (0, 40)
Another point of this parabola is (200, 100), as can be checked from the figure.
The vertex form of the equation of a parabola is :

, where (h, k) is the vertex of the parabola,
replacing (h, k) with (0, 40), we have:

to find a, we substitute (x, y) with (200, 100):

40,000a=60
a=60/40,000=3/(2,000)
So, the equation of the parabola is