Using the same animation on multiple elements

Using the same animation on multiple elements

I am performing the same animation three different times on three different elements. Is there a more efficient way to do this?

Here's my code:
  1. $('.tier1').animate({opacity:.2}, 500)
  2. $('.tier2').animate({opacity:.2}, 500)
  3. $('.tier3').animate({opacity:.2}, 500)
  4. $('.tier4').animate({opacity:1}, 500)

I can't just give them all the same class name since the active tier changes to 100% opacity based on interaction and I'd have to do a removeClass and addClass which I imagine would be just as much code.

I would appreciate any help I can get.