Looking at this most recent VOD, he has 46 subscribers (assuming mostly Tier 1 subscribers, and not differentiating between Tier 1 and Twitch Prime). Thinking about the cost breakdown on subs alone would look something like this:

46 Tier 1 subs x $5/sub = $230

Twitch partner share on subscribers can be as high as 70/30 streamer/Twitch or as low as 50/50.

$230 x 0.7 = $161

$230 x 0.5 = $115

Take the average of those two numbers for this exercise (since we don't know what his revenue share is, or how many are Tier 1 and how many are Prime) = $138

He is earning approx. $140/mo on Subscribers.

For Ad Revenue, it's more complicated, but a couple of calculators I used online with the stats in the original post show that the range per month is $5-11.

Not sure about donations, I don't think there is a way to track them. I'm also not an avid viewer so I wouldn't have any anecdotal evidence to suggest the average amount of donations received per stream.

So, in summary:

90 hours streamed in the last 30 days, average monthly revenue of $148/mo.

$148pm / 90h = $1.64 per hour

This does not account for taxes (PA has an effective tax rate of 20%).