2/$20 Beauty and the Beast read-aling book and tape

When you create a bundle of 2 items that say 2/$20, I'll send you an offer for $20. If you bundle 1 item that says 2/$20 and one that says 2/$30, I'll send you an offer for $25. If you bundle 1 item that says 2/$20 and 2 items that say 4/$20, I'll send you an offer for $20.