Van Dolah Petroleum had the following account balances for the years shown relating to a proved property:

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12/31/15 12/31/16 Proved property cost $ 30,000 $ 30,000 Accumulated DD&A-proved property. 6,000 Wells and equipment-IDC. . . . . 350,000 450,000 Accumulated DD&A-Wells and equipment-IDC. 60,000 Wells and equipment L&WE... 250,000 325,000 Accumulated DD&A-Wells and equipment-L&WE 55,000 2015 2016 Proved reserves, 12/31. . . . Proved developed reserves, 12/31. 800,000 Mcf 900,000 Mcf 500,000 Mcf 700,000 Mcf Production during 2015 and 2016 40,000 Mcf 60,000 Mcf Compute DD&A for the year ended 12/31/16.