multivariable calculus - Change linear plot to 100% plot in Wolfram Alpha

Recently I have used this input for WolframAlpha:

Plot (forumla1), (formula2), (formula3), {a, 0, 50}

It's generating "Linear Plot" like on picture on left. Is there way to make it generate "100%" plot like on picture on right? So that it will sum up, look of how big percentage formula generates and match it?

This isn't WolframAlpha, I used another software for generation.

I tried region function, but it doesn't work with 3 formula's apparently.