. in 2005 , the company expanded the number of inven- tory departments it utilizes for its gross profit calculation from 10 to 23 . the impact of this change in estimate on the company 2019s consolidated 2005 results of operations was an estimated reduction of gross profit and a corre- sponding decrease to inventory , at cost , of $ 5.2 million . store pre-opening costs pre-opening costs related to new store openings and the construction periods are expensed as incurred