Rep-Set Scheme Percentage

Hi,

Does anybody know how determine max doable perecentage of 1RM for given rep/set scheme with consideration of rest time between sets?

Every rep causes fatigue around 2 to 4 precentage of strength.

​Exemple: at 80% 5x5

Rep Weight on Bar Fatigue Relative Weight
1 80% 0% 80%
2 80% 3% 83%
3 80% 6% 86%
4 80% 9% 89%
5 80% 12% 92%

So every set builds fatigue and needs rest time.

80% of 1RM is around 8 reps doing 5x5 that few reps in reserve.
If rest time is 3 minutes, with more sets or reps precentage goes down, at 5x10 ( added reps) or 10x5 (added sets) precentage must be lower to be possibile to do it.
Lower rest time between sets decreasing precentage at what workout can be done.