The accounting records of Waterville Home Store show these data (in millions): (Click the icon to view the income statements.) The shareholders are very happy with Waterville's steady increase in net income. However, auditors discovered that the ending inventory for 2019 was understated by $3 million and that the ending inventory for 2020 was understated by $4 million. The ending inventory at December 31,2021 , was correct. Read the requirements. Years Ended December 31, 2021, 2020, and 2019 \begin{tabular}{rrrrrrr} \hline & 2021 & 2020 & & 2019 \\ \hline Net sales revenue & $ & 42 & $ & 39 & $ & 36 \end{tabular} Cost of goods sold: Beginning inventory Net purchases 34 32 30 Cost of goods available Less ending inventory Cost of goods sold Gross profit Operating expenses Net income Data table