How many entries is under 50s column when the average is 39.60?
CREATE TABLE table_30788 (
    "Player" text,
    "Matches" real,
    "Innings" real,
    "Runs" real,
    "Average" text,
    "Highest Score" text,
    "100s" real,
    "50s" real
)
SELECT "50s" FROM table_30788 WHERE "Average" = '39.60'
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 entries is under 50s column when the average is 39.60? ### Input: CREATE TABLE table_30788 (
    "Player" text,
    "Matches" real,
    "Innings" real,
    "Runs" real,
    "Average" text,
    "Highest Score" text,
    "100s" real,
    "50s" real
) ### Response: SELECT "50s" FROM table_30788 WHERE "Average" = '39.60'