Problem 9-9B Airdrie Services Inc. started business on March 1, 2014. The company produces monthly statements and had total sales of $600,000 (of which $570,000 were on account during the first four months. On June 30, the Accounts Receivable account had a balance of accounts have been written off to date), which was made up of the following accounts aged accord. ing to the date the services were provided