Please show a complete step-by-step solution for letter A. Thank you!

It appears the answers for DSO for 2018 98.3 or 98.27 and DSO for 2017 82.9 or 82.94 are wrong.

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