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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 ). DSO for 2018 DSO for 2017 daysdays 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