purchase price 550,000, period of useful 10 years, annual revenue 100,000,operating costs 32,000, depreciation 55,000 no income taxes can you show me how to get the answer I have an answer but not sure if it is correct

cost per year = 32,000 + 55,000 = 87,000

revenue per year = 100,000

profit/year = 13,000
so after ten years you have made 130,000 but you have depreciated the property to zero
550,000 -130,000 = 420,000 invested and not paid back

From now on you make 100,000-32,000 = 68,000 per year
420/68 = 6.2 more years before you really break even for total of 16.2 years.
However, particularly if taxes were part of this, you would be likely to sell it after ten years hopefully at a price greater than 420,000