You would need an insanely large amount of data to be even remotely close to figuring out that number - and it would still only be a rough estimate. However, just from personal experience: if you consider "Normal" to have 0% MF, Torment 1 can't have something like 1000% MF. In fact, even after the MF hotfix many people resort back to split farming on Normal because they don't feel any increase in drop on T1. I personally don't perceive a difference at all, actually. But it's just my subjective perception.
Also keep in mind that MF only accounts for 10% in terms of legendaries; even if it's 300% on T1, it would only be 30% for legendaries.
Also keep in mind that MF only accounts for 10% in terms of legendaries; even if it's 300% on T1, it would only be 30% for legendaries.