Database: financial (difficulty: simple)
Question: For the branch which located in the north Bohemia with biggest number of inhabitants, what is the percentage of the male clients?
SQL: SELECT CAST(SUM(T1.gender = 'M') AS REAL) * 100 / COUNT(T1.client_id) FROM client AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id WHERE T2.A3 = 'north Bohemia' GROUP BY T2.A4 ORDER BY T2.A4 DESC LIMIT 1