What is the net change in non-cash working capital that would appear on the cash flow statement given the following: i) Increase in cash of $500 ii) Increase in accounts receivables of $800 ii) Decrease in inventories of $350 iv) Decrease in prepaid expenses of $225 v) Increase in PP&E of $950 vi) Increase in accounts payable of $400 -$175 $175 $50 -$50