What is the percentage of solutions for the method that needs to be compiled in the English methods?
method that needs to be compiled refers to WasCompiled = 0; English method refers to Lang = 'en'; percentage of solutions = MULTIPLY(DIVIDE(SUM(WasCompiled = 0), COUNT(Solution.Id)), 100);
SELECT CAST(SUM(CASE WHEN T1.WasCompiled = 0 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(Lang) FROM Solution AS T1 INNER JOIN Method AS T2 ON T1.Id = T2.SolutionId WHERE T2.Lang = 'en'