Holt Developments Ltd, put an asset in service on January 1 2018. Its cost was $252.000. its predicted service life was six years, and its expected residual value was $25,200. The company decided to use double-declining balance depreciation. After consulting with the company's auditors, management decided to change to straight line depreciation in 2020, without changing either the original service life or residual value Required: a. What is depreciation expense for 2020? Answer is complete but not entirely correct. Depreciation $ 21,700 expense b. Calculate the effect of this change on retained earnings * Answer is not complete. Ruandag will increase by