Some 1-liners are difficult to figure out what it's doing. This one is pretty easy to read.

I also chose sorting, but I'd like to run some time comparisons on these different methods.
I'm pretty sure that memory swaps cost more time than comparisons.

I did sorting just like you. I need to learn when you can make an if else be on a single line.
I would like to compare the run speeds of this versus some of the other methods. Sorting should
be fast with most of them the same, no swaps should need to happen.

This has to do with floating point rounding errors. The formula can be rearranged a little bit so that the rounding errors have less impact, I believe.

If you have 1 red marbles and 99 green marbles in a box that is your 99 percent.
Now think about having the same 1 red marble and a quantity of green marbles such that
there are 98 percent green and 2 percent red. See if you can work out a formula for that.

Are you saying that the tests fail? What do you mean result 0?
I was having issues with most of them passing, and some failing.

Then I remembered about how computers store floating point and you can get
little rounding errors. Look at your formula and see if you can simplify it some.

Nice. I feel like I learn more by trying a certain way, then reading how others do it, and I'm like "wow cool!"

I think the first one I picked (count the vowels) was more difficult than this one. I'm not sure what level that one was. Of course, after I solved it, I saw several clever 1-Liners.