Prior to recording the following, Elite Electronics, Inc., had a credit balance of $2,100 in its Allowance for Doubtful Accounts. Required Prepare journal entries for each transaction. (If no entry is required for a transaction/event, select "No Journal Entry Required" in the first account field.) a. On August 31, a customer balance for $310 from a prior year was determined to be uncollectible and was written off b. On December 15, the customer balance for $310 written off on August 31 was collected in full