Cash available to all providers of capital, calculated before interest: operating profit taxed as if there were no debt, plus depreciation, less capital spending and the increase in working capital.
Operating profit of 1,600,000 taxed at 25% gives 1,200,000; plus 400,000 depreciation, less 500,000 capital spending and 100,000 of working capital, is 1,000,000.
Discounting this produces an enterprise value, from which net debt must be subtracted. Discounting cash measured after interest produces the equity value directly, and mixing the two is wrong by an amount nothing in the arithmetic reveals.