The following selected amounts were extracted from the financial statements of Boston Corporation. Year 4 Year 3 Year 2 Year 1 Net sales Cost of goods sold Gross margin $175,000 109,000 66,000 $170,000 104,500 65,500 $165,000 100,500 64,500 $150,000 93,000 57,000 Prepare a trend analysis for net sales, cost of goods sold, and gross margin (Round answers to the nearest tenth of 1 percent.) Use Year 1 as the base year BI E Year 4 Year 3 Year 2 Year 1 Nel sales Cost of goods sold Gross margin