The 2015 income statement for Duffy's Pest Control shows that depreciation expense was $200 million, EBIT was $510 million, and the tax rate was 35 percent. At the beginning of the year, the balance of gross fixed assets was $1,580 million and net operating working capital was $420 million. At the end of the year, gross fixed assets was $1,830mllion. Dufly's free cash flow for the year was $423 million. Calculate the end-of-year balance for net operating working capital. (Enter your answer in millions of dollars rounded to 1 decimal place.) Net operating working capital