What is the highest discount applied by the store located in a city of the state of Colorado whose land area is 111039036.
highest discount applied refers to Max(Discount Applied)
SELECT MAX(T1.`Discount Applied`) FROM `Sales Orders` AS T1 INNER JOIN `Store Locations` AS T2 ON T2.StoreID = T1._StoreID WHERE T2.State = 'Colorado' AND T2.`Land Area` = 111039036