Fraud Investigators Incorporated operates a fraud detection service. a. On March 31, 10 customers were billed for detection services totaling $33,000. b. On October 31, a customer balance of $1,900 from a prior year was determined to be uncollectible and was written off. c. On December 15 , a customer paid an old balance of $820, which had been written off in a prior year. d. On December 31, $580 of bad debts were estimated and recorded for the year. On March 31,10 customers were billed for detection services totaling $33,000. Record the transaction. Note: Enter debits before credits. On October 31 , a customer balance of $1,900 from a prior year was determined to be uncollectible and was written off. Record the transaction. Note: Enter debits before credits. Record the reversal of the write-off of a $820 customer account. Note: Enter debits before credits. Record the cash collected $820 from the customer. Note: Enter debits before credits. On December 31,$580 of bad debts were estimated and recorded for the year. Record the transaction. Note: Enter debits before credits