Upvote:1
The PDF in the source below lists, year for year, the buying value in Euros of 2020.
Sources:
Upvote:2
The hyperinflation of 1923 ended in November 1923 with the introduction of the Rentenmark and, in August 1924, of the Reichsmark. The value of German money became stable again and remained so until WWII.
This article has average wages for various industries in 1935 on page 30. They are between 50 and 100 Pfennigs, i.e. betweeen 0.5 to 1 Mark. Piano lessons would probably considerably more expensive than the hourly wage of an industry worker, but probably not much more than a day's wage?