discounted per-minute rates for World Select 300

The link below mentions that 

Note: Some call plans have discounted per-minute rates for each termination type (e.g., Carefree Minutes Latin America 300 and Carefree Minutes World Select 300).

https://www.xfinity.com/support/articles/international-call-plan-bill 

How does one find out what those discounted per-minute rates rates are?