About "A Guide to Dead by Daylight Math".
First of all, I would like to thank @Mandy for writing this.
For a lot of people, math isn't our strong suit in the first place. Add in dozens of perks, powers, add-ons and more that affect action speeds and things can get really confusing, really fast. But for those so inclined to bust out a calculator and figure out how long something will take- we've got you! In this post, we'll…
The various Dead by Daylight Math are now clearer and more enjoyable to play on a daily basis.
One thing I did notice.
What is the number 0.69375? I assume you mean 16 / 0.804 = ≈ 19.9 seconds....

Comments
Not sure, though it actually shouldn’t be 0.804 either. The example incorrectly uses -25% for Mangled when in reality it is -20%.
(The in-game description of Mangled says it increases the time to heal by 25%, but this is misleading because this is not the action speed debuff; this is the equivalent of reducing the action speed by 20%).
That is correct. You are right Mangled is -20%.
So, if I rearrange the relevant part and rewrite it correctly, it would look like this?
Example
Say you have Botany Knowledge (+50%) and a First Aid Kit (-33%) with Medical Scissors (+10%), but you're under the effects of the Killer's perk, Sloppy Butcher (-20%). If you were to heal yourself, the math would something like this:
1. The sum of the positive modifiers is: 0.5 + 0.1 = 0.6
2. The product of the negative modifiers is: (1 - 0.33) * (1 - 0.20) = 0.536
3. The final charges per second is therefore: (1 + 0.6) * 0.536 = 0.8576
4. The total time it would take to heal a Survivor is: 16 / 0.8576 = ≈18.7 seconds
Anyone else notice anything else, let's all help @Mandy out.
You are both correct! This post was written a while ago, but some things had changed since then. It looks like I made a mistake when updating it.
I've gone back and fixed those mistakes, thank you for pointing them out!
Thanks for the quick correction! I found GAME INFO articles like this one very useful.
I hope you will write many more articles like this one in the future.
Thank you @Peanits and @Mandy !
Yep that looks correct.
Awesome! Thank you for fixing it
Just to clarify, I didn't write this - we do not allow me to do maths, that would not end well.
All the credit for this post goes to @Peanits who is a wizard and took the time to explain this.