x40 in 90 days is in increase of 240% monthly (i.e. from 100% to 340%).
So it's a lot of inflation. This is not unheard, but it's very high and usually happens in countries with bigger problems. https://en.wikipedia.org/wiki/Hyperinflation#Notable_hyperin...
[Hi from Argentina, our peak was in July 1989 with 196% (i.e. from 100% to 296%), but the peak was short, we didn't have three months with 200% of mensual inflation. See the graph in https://es.wikipedia.org/wiki/Hiperinflaci%C3%B3n_argentina_...]