Original: In December 1923 the exchange rate was 4,200,000,000,000 Marks to 1 US dollar.Bresciani-Turroni , page 335 In 1923 , the rate of inflation hit 3.25 × 106 percent per month ( prices double every two days ) .
Simplified: In December of 1923 the exchange rate was 4,200,000,000,000 Marks to 1 US dollar . Sometimes the rate of inflation was so high that prices doubled every two days .