CREATE TABLE table_36923 ("County" TEXT, "Per capita income" TEXT, "Median household income" TEXT, "Median family income" TEXT, "Population" FLOAT, "Number of households" FLOAT)

What is the Per capita income associated with a Median household income of $55,800?
SELECT "Per capita income" FROM table_36923 WHERE "Median household income" = '$55,800'
SELECT "Per capita income" FROM "table_36923" WHERE "Median household income" = '$55,800'