Write SQL query to solve given problem: What is the percentage of female audiences who viewed movies with rating 2?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(IIF(T2.u_gender = 'F', 1, 0)) AS REAL) * 100 / COUNT(T2.userid) FROM u2base AS T1 INNER JOIN users AS T2 ON T1.userid = T2.userid WHERE T1.rating = 2