Based on Amazon's 2021 Annual Report 

 

What percentage of total assets does  accounts receivables represent for each of the last three years? 
Use Amazon's  10-K (2021) to determine what additional disclosure is available concerning the allowance for doubtful accounts. (Usually, the information is in a 
separate schedule) 
What is bad debt expense as a percentage of sales for the last three years?
What is the effect of the change in receivables on cash flows from operating activities for the most recent year (that is, did the change increase or decrease operating cash flows)? Explain your answerin details and show your calculations.