Whispering Winds Corp. reported these income statement data for a 2-year period. Whispering Winds Corp. uses a periodic inventory system. The inventories at January 1, 2021, and December 31, 2022, are correct. However, the ending inventory at December 31,2021 , is overstated by $5 , 500 . Prepare correct income statement data for the 2 years. What is the cumulative effect of the imventory error on total gross profit for the 2 years? Cumulative effect of the inventory error $.