DEF Flooring Company had the following account balances (before adjustment) on December 31 , 2021 ( fiscal year-end). DEF Flooring Company estimates that 3% of Accounts Receivable will be uncollectible at year-end (based on an aging analysis). Instructions: a) Prepare the adjusting journal entry to record the estimate of uncollectible accounts receivable at year-end. (2 marks) b) Assume instead that the company decides to estimate its uncollectible accounts receivable as 2% of its net credit sales of $300,000. Prepare the adjusting journal entry in this case. ( 2 marks) c) Why would the Allowance for Doubtful Accounts account have a credit balance (before adjustment) at year-end? (1 mark)