4. 125 points] A laser surgical tool has a cost basis of $300,000 and a five-year depreciable life. The estimated salvage value of the laser is $30,000 at the end of five years. a) By using Straight Line (SL) method, determine the annual depreciation amount and book b) By using Declining Balance (DB) method, determine the depreciation amount after four Hints: There is no connection between SL and DB method here. Calculate separately, which value (BV) after four years. years and book value (BV) after four years. Use 200% DB, where R-2N. means no swich over)