1. Calculate Days in Accounts Receivable for the years presented.Why did this trend in AR Turnover and Days in AR occur?

Key Financial Data ($000 Omitted) Year Ended December 31 Gross Profit Net Sales Revenue Gross Profit % At Dec 31 Net Profit Margin COGS/Sales SG&A/Sales Total Asset Turnover Inventory Turnover A/R Turnover 2017 2,238,723 4,976,553 45.0% 2017 (0.97%) 55.01% 41.93% 1.30 2.64 8.08 2016 2,240,611 4,825,335 46.4% 2016 5.33% 53.57% 37.78% 1.48 3.04 9.14 2015 1,905,547 3,963,313 48.1% 2015 5.87% 51.92% 37.77% 1.60 3.12 11.11 2014 1,512,206 3,084,370 49.0% 2014 6.75% 50.97% 37.55% 1.68 3.13 12.59