1 USD = 23.5 CZK. 1b CZK = US$42.5m

This is an article written in Czech, about an incident that occurred in Czechia. Assuming USD makes no sense.

The Czech Republic didn't join the Euro, so you'd need to divide the number by about 25 to get Euros or Dollars.

Exchange rate is 1 EUR to 25 CZK.

since the original article is in Czech and the event happened in Czechia, it's gonna be billions of Czech Crowns. 1 billion CZK is approximately 40 million EUR.