Write SQL query to solve given problem: What is the percentage ratio of students who are enlisted in foreign legions that have a due payment?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(IIF(T1.bool = 'pos', 1, 0)) AS REAL) * 100 / SUM(IIF(T1.bool = 'neg', 1, 0)) FROM no_payment_due AS T1 INNER JOIN enlist AS T2 ON T1.`name` = T2.`name` WHERE T2.organ = 'foreign_legion'