Checl Western Windows constructs and installs windows for new homes. The sales staff are having a meeting and reviewing the following information to determine how to help reduce days' sales uncollected. Accounts receivable Net sales 2020 $635, 750 6, 692,000 2019 2018 $ 474,750 $ 420,000 5,724,000 5, 120,000 Required: a. Calculate the days' sales uncollected for 2018 to 2020 and identify whether the trend is favourable or unfavourable. (Round the final answer to 2 decimal places. Do not round intermediate calculation. Use 365 days a year.) 2016 2017 days 2015 days Days' sales uncollected days