Please, show the formulas you used

The following is ABC Corp. 2020 income statement: Sales = $305,000, Costs = $176,000, Other expenses = $9,000, Depreciation expense = $18,200, Interest expense = 12,900, Dividends = 18,300. Tax rate is 3 percent. In addition, you're told that the firm issued $5,900 in new equity during 2020 and redeemed $52,000 in outstanding long-term debt. If net fixed assets increased by $43,000 during the year, what was the changes in NWC