how many county with per capita income being $20,101
CREATE TABLE table_18764 (
    "Rank" real,
    "Place" text,
    "County" text,
    "Per Capita Income" text,
    "Median House- hold Income" text,
    "Population" real,
    "Number of Households" real
)
SELECT COUNT("County") FROM table_18764 WHERE "Per Capita Income" = '$20,101'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: how many county with per capita income being $20,101 ### Input: CREATE TABLE table_18764 (
    "Rank" real,
    "Place" text,
    "County" text,
    "Per Capita Income" text,
    "Median House- hold Income" text,
    "Population" real,
    "Number of Households" real
) ### Response: SELECT COUNT("County") FROM table_18764 WHERE "Per Capita Income" = '$20,101'