On August 1, 2020, YYZ Corporation purchased equipment for Operation 2-30 points, costing $100,000, and paid $100,000 to install and test the equipment. The equipment is expected to last for 4 years and has a salvage value of $160,000. Using Double Declining Balance, determine the depreciation expense for the years ended: 12/31/21, 12/31/22, 12/31/23, 12/31/24.