Given below is the post-closing trial balance of Super Sales, Inc. as of November 30, 2021 Super Sales, Inc. Trial Balance November 30, 2021 Credit $ Cash Accounts Receivable Debit 9,598 7,780 $ $ 2,197 $ 800 $ 15,000 $ 3,000 Supplies Prepaid Insurance Equipment Accumulated Depreciation - Equipment Accounts Payable Notes Payable Interest Payable Unearned Service Revenue Common Stock Retained Earnings $ $ $ $ $ 3,300 5,000 100 1,200 16,000 6,775 35,375 $ $ $ $ 35,375 The December transactions were as follows. Dec 5 Received $1,500 in cash from customers for accounts receivable due. 10 Billed customers for services performed $3,900. 15 Paid employee salaries $2,200. 17 Performed $1,000 of services for customers who paid in advance in August 2021. 20 Paid $1,050 to creditors for accounts payable due. 29 Bought supplies amounting to $700. 30 Paid engineer's fees for repairing the equipment $400. Additional information: 1. Insurance expires at the rate of $160 per month. 2. Supplies on hand total $2,000. 3. Depreciation on the equipment is $250 per month. 4. The note payable is dated August 1. It is a 15-month, 6% note. a Journalize the transactions for the month of December. No narration is required. b/ Prepare the unadjusted Trial Balance as of December 31, 2021. You have to follow the sequence in e/ when preparing the Trial Balance. c/ Based on the additional information given, prepare the adjusted Trial Balance as of December 31, 2021. You have to follow the sequence in e/ when preparing the Trial Balance. d In no more than 120 words explain with example(s) what are source documents of an accounting information system. The example(s) must come from your personal experience. el Accounts Receivable Supplies Prepaid Insurance Equipment Accumulated Depreciation - Equipment Accounts Payable Notes Payable Interest Payable Unearned Service Revenue Common Stock Interest Expense Service Revenue Salaries and Wages Expense Maintenance Expenses Retained Earnings Insurance Expenses Supplies Expense Depreciation Expense