1. A reactor will be purchased for $ 30,000 for use in a chemical process. The life of the reactor is 10 years, and at the end of the 10th year, the scrap value is $ 2000. Calculate the annual depreciation to be reserved for the reactor; 3. a) Declining balance (Matheson) method, 4. b) Sum of the years- digits method, 5. c) If annual interest rate is 10%, sinking -fund method