Analyzing Accounts Receivable Required a. Calculate days sale outstanding (DSO) for 2018 and 2017. Note: Round amount (your final answer) to one decimal place (for example, enter 6.8 for 6.77555). b. Determine the total amount that customers owe Lupin each year. Note: Round dollar amount (your final answer) to one decimal place (for example, enter 6.8 for 6.77555 ). c. What proportion of trade receivables is doubtful each year? Note: Round percentage (your final answer) to two decimal places (for example, enter 0.66\% for 0.6555\%). d. From this ratio, what do we conclude about the quality of its trade receivables over time? We can conclude that the quality of receivables has over time