This calculation includes only the money due to ancestors and their descendants, in terms of the stolen actual labor counted in person-hours, based on a minimal economic value of that labour, adjusted at a lowest reasonable rate of interest.
Every step in the following calculation will use the lowest possible evaluators, such as to produce a MINIMUM amount due.
In the 70 year period between 1790 and 1860, there were, on average, 2 million slaves at any time in the USA. In the same period the average US population was 14 million.
Moving forward to 2000, the US population was 309 million, with 40 million slave descendants.
To obtain a minimal (under estimated) annual interest rate, we use the population increase from 14 million to 309 million in the 140 years from 1860 to 2000.