Michelle acquired an oil well for $500,000. The estimate of recoverable units is 25,000 barrels. The expected useful life of the well is 6 years. Michelle produces 5,000 barrels during the year and sells 4,000 barrels for $200,000. The taxable income from the activity, excluding the depletion deduction, is $40,000. The depletion percentage for oil is 15%. 

What is Michelle's cost depletion amount?