What was value of French franc in 1940?

In 1940, the French franc was significantly affected by the economic turmoil of World War II and the German occupation of France. The official exchange rate was approximately 20 francs to 1 US dollar at that time, but the actual value was often much lower due to inflation and black market fluctuations. The franc's stability deteriorated further as the war progressed, leading to a rapid devaluation.