Vertical analysis on cost of goods sold was performed in 2018 and 2019. The results were 65% in 2018 and 71% in 2019. This would mean that: Ogross margin has declined, cost of goods sold as a percentage of net sales has increased, and the dollar amount of cost of goods sold has increased. Ogross margin has declined. cost of goods sold as a percentage of net sales has increased. the dollar amount of cost of goods sold has increased. None of the available answers is correct