Learning Rate Rate

Hi :

I am currently in the revision stages for the F5 exam.

Based on BPP study text when the learning rate ends after a specific unit this means you need to find the incremental time for the unit after and the current unit

e.g. The learning rate ends after producing unit 100

The “standard time/unit” should therefore be the difference between the 101 and 100 unit.

When they say ended at it means the previous unit and the current unit

same example: 99 and 100

However I have seen a paper where it said the learning rate ended after the 100th unit was produced however the difference between 99 and 100 was used.

Can someone provide me some assistance.