Using the table below calculate free cash flow to the firm.

$\backslash$table$[[$Gross profit,$350],[$Operating expenses,$50],[$Efective tax rate,$0\mathrm{.}25],[$Depreciation expense,$25],[$Operating working capital investment,$40],[$Cash used to acquire fixed assets,$60]]$

$\backslash$table$[[,],[,],[,],[,],[,],[,],[,],[,]]$