Problem 9-9B Airdrie Services Inc. started business on March 1, 2014. The company produces monthly financial statements and had total sales of $600,000 (of which $570,000 were on account) during the first four months. On 30, the Accounts Receivable account had a balance of $210,000 (no accounts have been written off which was made up of the following accounts aged accord ing to the date the services were provided