Ringo Company had $900,000 of sales in each of three consecutive years 2010 - 2012, and it purchased merchandise costing $500,000 in each of those years. It also maintained a $200,000 physical inventory from the beginning to the end of that three-year period. In accounting for inventory, it made an error at the end of year 2010 that caused its year-end 2010 inventory to appear on its statements as $180,000 rather than the correct $200,000. Prepare comparative income statements to show the effect of this error on the company's cost of goods sold and gross profit for each of the years 2010?2012.