Memorial Medical Center bought equipment on January 2 for $27000. The equipment was expected to remain in service for four years and to perform 600 operations. At the end of the equipments useful life, memorial estimates taht its residual value will be &6000. the equipment performed 60 operations the first year, 180 the second year, 240 the third year and 120 the fourth year.

Prepare a dchedule of depreciation expense per year for the equipment under the three depreciaion methods. After two years under double-declining balance depreciation, the company swithched to the straight line method.