4. At the beginning of the year, a firm had $250 in cash, $780 in accounts receivable, $1250 in inventory, and $5,500 in fixed assets. The firm also had $1,500 in accounts payable, $875 in short term debt, and $5,405 in long-term debt at the beginning of the year. At the end of the year, the firm had $400 in cash, $1,230 in accounts receivable, $650 in inventory, and $4,950 fixed assets.The firm also had $2,000 in accounts payable, $100 in short-term debt, and $5,130 in long-term debt at the end of the year. What is the firm's change in net working capital?

5. At the beginning of the month a firm has $1,260 in cash, $950 in accounts receivable, $3,300 in inventory and $6,800 in fixed assets. The firm also had $2,400 in accounts payable and $9,910 in long-term debt. At the end of the month a firm has $1,480 in cash, $850 in accounts receivable, $3,420 in inventory and $6,650 in fixed assets. The firm also has $2,250 in accounts payable, $240 in short-term debt, and $9,910 in long-term debt. What was the change in the firm's net working capital?