How do you convert M/S to %?

In Dead By Daylight, Movement speed is tracked in M/S and in %, however I am curious how m/s is converted into % as some things in the game are labeled as just +0.4 m/s and don't say what the new M/S is

So if you increase a 115% killers m/s by 0.1, what will the new movement speed be in percent?

Sorry if the post is confusing, this is hard to explain for me

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