Revenue Journal; Accounts Receivable subsidiary and General Ledgers Sage Learning Centers was established on July 20 to provide educational services. The services provided during the remainder of the month are as follows: July 21. Issued Invoice No. 1 to J. Dunlop for $85 on account. July 22 . Issued Invoice No. 2 to K. Tisdale for $355 on account. July 24. Issued Invoice No. 3 to T. Quinn for $75 on account. July 25. Provided educational services, $140, to K. Tisdale in exchange for educational supplies. July 27. Issued Invoice No. 4 to F. Mintz for $210 on account. July 30. Issued Invoice No. 5 to D. Chase for $190 on account. July 30. Issued Invoice No. 6 to K. Tisdale for $145 on account. July 31. Issued Invoice No. 7 to T. Quinn for $100 on account. 1a. Journalize the transactions (in chronological order) for July, using a single-column revenue journal. 3a. What is the sum of the balances of the customer accounts in the subsidiary ledger at July 31 ? 3b. What is the balance of the accounts receivable controlling account at July 31 ? $ manual system EXCEPT