The table below contains data on Fincorp Inc. The balance sheet items correspond to values at year-end 2015 and 2016, while the income statement items correspond to revenues or expenses during the year ending in either 2015 or 2016. All values are in thousands of dollars.

2015 2016
Revenue $4,000 $4,100
Cost of goods sold 1,600 1700
Depreciation 500 520
Inventories 300 350
Administrative expenses 500 550
Interest expense 150 150
Federal and state taxes 400 420
Accounts payable 300 350
Accounts receivable 400 450
Net fixed assets' 5000 5800
Long-term debt 2000 2400
Notes payable 1000 600
Dividends paid 410 410
Cash and marketable
securities 800 300

* Taxes are paid in their entirety in the year that the tax obligation is incurred.
Net fixed assets are fixed assets net of accumulated depreciation since the asset was installed.
Working Capital. What was the change in net working capital during the year?

Net working capital is the difference between Current assets and current liabilities. Change in net working capital is the difference between net working capital at the beginning and st the end.

current assets at the beginning =( 300+400+800)=1500

Current assets at the end = ( 350+450+300)= 1100

current liabilities at the beginning = (300+1000)= 1300

current liabilities at the end = (350+600)= 950

net working capital at the beginning = 1500 - 1300= 200

net working capital at the end = 1100 - 950= 150

therefore the change in net working capital for the year is 200 - 150 =50 000