How has inflation behaved since 1980?
Source with details: https://fred.stlouisfed.org/graph/?g=1JxIa
Then calculate cumulative inflation as the proportional change in the price level, like this:
(P_final - P_initial) / P_initial = (125.880 - 37.124) / 37.124 = 2.39
This shows that the overall price level (the cumulative inflation embodied in the PCEPI) has increased by about 2.39 times over the period, which is 239%.
Overall, historical comparisons of inflation numbers are so imprecise to be practically worthless the longer the timescale. You can expect the real figure to be much greater in reality for consumers, given the political incentive to lie over inflation data.
3.389 - 1 (to account for increase) = 2.38 ~ 239%