Steele Inc. purchased a machine for $500,000 on January 1, Year1. The machine has a $20,000 residual value and an estimated life of 20 years. The machine is expected to produce 1,000,000 widgets over its life. Steele prepares annual financial statements at 12/31 each year. What is the 'depreciable cost' of the machine? (This would be the same regardless of what method of depreciation is used.)