1. What is the company's net book value of accounts receivables as of Aug 2, 2020, and Feb 2, 2020, respectively?
2. What is the company's allowance for doubtful accounts as of Aug 2, 2020, and Feb 2, 2020, respectively?
3. Based on the answers to the above two questions, briefly comment on the ratio of allowance for doubtful accounts to gross accounts receivable.
4. What method did the company use to estimate bad debt expense?
5. What factors affect the bad debt expense estimate?

August 2, February 2, 2020 2020 UNAUDITED AUDITED ASSETS Current Assets: Cash and cash equivalents $ 1,394.3 $ 503.4 Trade receivables, net of allowances for credit losses of $76.9, $21.1 and $22.2 568.8 741.4 Other receivables 27.4 23.7 Inventories, net 1,642.2 1,615.7 Prepaid expenses 158.6 159.9 Other 55.5 112.9 Assets held for sale 237.2 Total Current Assets 3,846.8 3,394.2 August 2, February 2, 2020 2020 UNAUDITED AUDITED ASSETS Current Assets: Cash and cash equivalents $ 1,394.3 $ 503.4 Trade receivables, net of allowances for credit losses of $76.9, $21.1 and $22.2 568.8 741.4 Other receivables 27.4 23.7 Inventories, net 1,642.2 1,615.7 Prepaid expenses 158.6 159.9 Other 55.5 112.9 Assets held for sale 237.2 Total Current Assets 3,846.8 3,394.2