The aging of accounts receivable as of December 31, 2020, are provided below: Outstanding Accounts receivable 0 days 1-30 days 31-60 days 61-90 days 91 - 120 days Over 120 days 2,500,000 1,500,000 400,000 300,000 200,000 100,000 Compute for the following: 7. Allowance for doubtful accounts as of December 31, 2020 8. Doubtful accounts expense on December 31, 2020 9. Carrying amount of the accounts receivable as of December 31, 2020 Expected uncollectible 0% 5% 10% 15% 20% 25%