Write SQL query to solve given problem: What is the ratio of the highest and lowest temperature in store 11?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST((MAX(T1.tmax) - MIN(T1.tmin)) AS REAL) / MIN(T1.tmin) FROM weather AS T1 INNER JOIN relation AS T2 ON T1.station_nbr = T2.station_nbr WHERE T2.store_nbr = 11