need help solving this. please show steps

Universal Arm (a robot) costs $10,000. At the end of its seven-year useful life, its salvage value is estimated to be $3,000. Compute the annual depreciation allowances (Dn) and the resulting book value (Bn), using (1) the straight-line (SL) depreciation method, and (2) the double-declining-balance (DDB) method (revise the table based on one of the three cases). Show the formula used for year 1