Selected balance sheet information for the Wolf Company at November 30, and December 31, 2021, is presented below. The company uses the perpetual inventory system and all sales to customers are made on credit. Accounts receivable Prepaid insurance Inventory Accounts payable Salaries payable Nov. 30 Debits Credits 10,300 5,300 7,300 12,300 5,300 Dec. 31 Debits Credits 3,300 7,800 6,300 15,300 3,300 The following cash flow information also is available: a. Cash collected from credit customers, $83,000. b. Cash paid for insurance, $5,300. c Cash paid to suppliers of inventory, $63,000 (the entire accounts payable amounts relate to inventory purchases). d. Cash paid to employees for salaries, $10,300. Required: 1. Determine the following for the month of December: a. Sales revenue b. Cost of goods sold c. Insurance expense d. Salaries expense