Count occurrences based on concatenated strings

Hey there,

Quetion, right of the bat: How do we count occurences based on threshold we have when values are concatenated?

Details:
So here's the situation: a donut chart has to be built.

Chart is based on a count of occurences based on following conditions:

Each phase has its own threshold, every threshold has its own color:

1. < 80% is red for all phases
2. 80-95 % for phases A and D
3. 80-99 % for phases B and C

In a table visual, we have measures that reflect upcoming phase and percentage of its readiness that is a main factor of making count: 

 It's easy to count occurencess based on their threshold when there is only one phase (like, if it's < 80%, it'll go as 1 point to "red" category". 
  But the problem is that there are times when phases are merged, and "readiness" measure here in table creates a concatenated string to display readiness ( 100%, 5.26%). 
These values might have different thresholds, that's why following condition is applied:
     - We assign a color based on the last value (i.e. if one is 100 and the second is 5.26 - we assign the color red, because we judge it by the last value).

thank you