Among all Disney movies directed by Gary Trousdale, determine the percentage that earned over USD100m based on actual grossing.
DIVIDE(COUNT(movie_title where director = 'Gary Trousdale' and total_gross > 100000000), COUNT(movie_title where director = 'Gary Trousdale')) as percentage;
SELECT CAST(COUNT(CASE WHEN CAST(REPLACE(trim(T1.total_gross, '$'), ',', '') AS REAL) > 100000000 THEN T1.movie_title ELSE NULL END) AS REAL) * 100 / COUNT(T1.movie_title) FROM movies_total_gross AS T1 INNER JOIN director AS T2 ON T1.movie_title = T2.name WHERE T2.director = 'Gary Trousdale'