That's pretty good advice Tara!

For higher levels, there's an interesting method that you can use - it takes a bit of math, but it's not that difficult:

When you reach a new Reputation badge level, go to your Badges page, click the Globetrotter badge, and you'll see the total number of shops you've completed (alternatively, you can download your Payments and see the total number of completed shops there). Mark that number down somewhere.

Then, when you reach 10% of that level, check your total number of completed shops again, to see how many shops it took to get to 10%.

Multiply that by 10, and you'll get an approximate total number of shops you need to do on that level to get to the next one.