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 2019 2018 $ 631,500 $ 400,500 $ 342,000 6,682,000 5,791,000 5,075,000 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.) 2017 2016 2015 Days' sales uncollected days days days