Walter Melon Produce uses the units-of-activity method for depreciation. It purchases a new vegetable washing machine for $24,000 that will wash an estimated 100,000 vegetables over its useful life. Estimated salvage value at the end of its useful life is $2,000.

Assuming 20,000 vegetables were washed in its first year of use, what would be correct depreciation expense Walter Melon Produce should record this year?