I think "inflation rate" (even if properly computed) is a misleading metric. A much better one is purchasing power half-life, i.e. how much time until your purchasing power goes down in half.

With a 2% inflation rate, half-life is 34 years.

With a 10% inflation rate, half-life is 7 years!

With a 20% inflation rate, half-life is 3.5 years 😨

The reason for this is that inflation rate compounds, resulting in a logarithmic relationship with half-life. Humans don't find logarithms intuitive, hence why most don't find a 10% inflation rate that daunting.

Compute it yourself:

half-life = log(2)/ inflation-rate