In 2019, Firm X had revenues of $200 million, costs excluding depreciation of $70 million, depreciation expenses of $20 million, interest expenses of $40 million and capital expenditures of $15 million. Net working capital was $35 million at the end of 2018 and $25 million at the end of 2019. The corporate tax rate is 20%. What was the firms unlevered cash flow in 2019?