Problem 7-3 Mitchell and O'Brien, CPAs, P.C., prepared 600 business and personal tax returns for the filing season ending April 15, 2019, for total billings of $135,000. On May 1, 2020, Mitchell and O'Brien wrote off $2,600 related to the services performed in 2019. The firm determined that, based on past experience, approximately 3% of fees would be uncollectible. Problem 7-3 Mitchell and O'Brien, CPAs, P.C., prepared 600 business and personal tax returns for the filing season ending April 15, 2019, for total billings of $135,000. On May 1, 2020, Mitchell and O'Brien wrote off $2,600 related to the services performed in 2019. The firm determined that, based on past experience, approximately 3% of fees would be uncollectible