Shrives publishing recently reported $10,750 of sales, $5,500 of operating costs other than depreciation, and $1,250 of depreciation. the company had $3,500 of bonds that carry a 6.25% interest rate, and its federal-plus-state income tax rate was 35%. during the year, the firm had expenditures on fixed assets and net operating working capital that totaled $1,550. these expenditures were necessary for it to sustain operations and generate future sales and cash flows. what was its free cash flow?