Based on it being a steady incline, I'd say 111.
But if it was up and over a big step in the green it's a whole different ball game.
Those type of putts had me beat for long enough, so I came up with a method that works for me.
I look at these putts in 3 parts, like this -
(not to any scale ^^^ just to give you the idea of what the hell I'm on about.)
Parts A and C are just the normal calculation of lengths and incline.
Part B -
I work out what fraction of the overall distance is the horizontal element of B.
I work out the vertical element of B.
If the step (B) is 18 inches high and it's length is one third of the overall putt length. I take away one third from step height. So I would add 12 inches to my putt.
(the math was arrived at by pure trial and error but the ratios seem to work)
Then resultA+resultB+resultC = final putt distance.
Sounds terribly complicated but I've been doing it so long I can do them by sight/memory/feel now.
I'm not a great putter at all but even on real long stepped putts I usually get very close.
I haven't seen this discussed before (I'm sure it has though),but I'd be interested in hearing other peoples methods and opinions.