WooHoo! and a Question for you

My yarn stash is growing by leaps and bounds this year. I've got so much yarn and so little time. What a great problem to have.

Here's another wonderful problem:

A friend of mine (who has a gorgeous hubby and four perfect children) went on a mission trip to Peru. I asked her to bring me back some yarn. I didn't mention color or anything, just said "surprise me." Well, she did.

I got 20 skeins of an alpaca/wool/cotton blend. 10 are dark gray, 5 are a medium/light gray and are a bright pink. And get this - all 20 skeins were only $39.00! Woohoo!

Now, on to the problem. The label states that it is 5o grams. There is no yardage listed. I'm getting 13 wraps per inch, so I'm guessing it's either a light worsted or heavy sport, take your pick. I'm at a loss from there. I don't know how to figure out my yardage and I suck at math. Any brilliant math people out there who can help me figure this out?

I also don't know what to make with it. But I'm so excited about this!!!

I don't have a pic of it yet, but here's some sheep pr0n for you: ;)