Is the setting "XPMultiplier" multiplicative with the individual xp settings such as "KillXPMultiplier" or is it separate?

For example if i have my XPMultiplier at 4 and my KillXPMultiplier at 5 is the amount of kill xp I get 20x or is it 5x?

I wish there was a straight forward answer, but ARK is buggy when it comes to some of those features. In general, it's multipliciative, but occasionally it's additive.

Meaning it can be either 20x or 9x in your example.