Transaction Entries, Posting, Trial Balance, and Adjusting Entries Market-Probe, a market re- search firm, had the following transactions in June, its first month of operations. June J. Witson invested $28,000 of personal funds in the firm in exchange for common stock. 2 The firm purchased the following from an office supply company: office equipment, S11,040; office supplies, $2,840. Terms called for a cash payment of $4,000, with the remainder due in 60 days. (Make a compound entry.) 3 Paid Junc rent, $1,275 4 Contracted for four months' advertising in a local newspaper at $325 per month and paid for the advertising in advance. 5 Signed a six-month contract with an electronics firm to provide research consulting services at a rate of $3,200 per month. Received two months' fees in advance. Work on the contract started immediately 6 Billed various customers for services rendered, $7,500 7 Paid two weeks' salaries (five-day week) to employees, $3,600 8 Paid J. Witson's travel expenses to business conference, $1,440. 9 Paid $520 cash for postage to mail questionnaire. 10 Paid two weeks' salaries to employees, $3,600 11 Billed various customers for services rendered, $7,200. 12 Collected $7,800 from customers on account. 13 J. Witson received a $2,500 cash dividend. Required Set up a general ledger that includes the following accounts: Cash; Accounts Receivable; Office Supplies; Prepaid Advertising; Office Equipment; Accumulated Depreciation-Office Equip- ment; Accounts Payable; Salaries Payable; Unearned Service Fees; Common Stock; Dividends; Service Fees Earned; Salaries Expense; Advertising Expe Supplies Expense; Rent Expense Travel Expense; Depreciation Expense-Office Equipment; and Postage Expense. Record June transactions in general journal form and post to the ledger accounts. Prepare an unadjusted trial balance as of June 30. Record adjusting journal entries in general journal form, and post to the ledger accounts. The fol lowing information is available on June 30: a. b. C. d. Office supplies on hand, $1,830 Accrued salaries, $925 Estimated life of office equipment, eight years. Also, make any necessary adjusting cntrics for advertising and for service fees indicated by the June transactions