user: Question: What Per capita income has a Median family income of $50,755?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Washington', '$36,248', '$79,109', '$92,087', 238136.0, 87859.0]
SQL:

assistant: SELECT "Per capita income" FROM "Table" WHERE "Median family income" = '$50,755';