Horner Watch Company reported the following income statement data for a 2-year period. Horner uses a periodic inventory system. The inventories at January 1, 2013, and December 31, 2014, are correct. However, the ending inventory at December 31, 2013, was understated $6, 750. (a) Prepare correct income statement data for the 2 years. (b) What is the cumulative effect of the inventory error on total gross profit for the 2 years? The cumulative effect on total gross profit for the two years is $