Please show how you get each answer. Thank you!

A machine costing $153,000 was purchased May 1. The machine should be obsolete after four years and, therefore, no longer useful to the company. The estimated salvage value is $15,000. Calculate the depreciation expense for each year of its expected useful life using each of the following depreciation methods (a) straight-line, (b) double-declining balance. For double-declining balance, do not round until your final answer. Round your final answers to the nearest dollar a. Straight-line: Year 1: 23,000 Year 2: 34,500 34,500 34,500 11,500 ear Year 4: ear b. Double-declining balance Year 1: 51,000 51,000 25,500 Year 2: ear Year 4: 10,500