user: Question: What is the median household income when the per capita is $21,585?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Williamson', '$41,220', '$87,832', '$100,407', 183182.0, 64886.0]
SQL:

assistant: SELECT "Median household income" FROM "Table" WHERE "Per capita income" = '$21,585';