how do you calculate this?

Assume the following: 10 years Cost of equipment 3,600,000 Estimated residual 400,000 Expected useful life Total productive capacity of machine 1,500,000 Production in FY 2009 250,000 Expected production/year for remaining years 138,889 If the company uses units of production depreciation, then the first year depreciation expense will be closest to: O $600,000 $533,333 $296,296