Modified problem 8.20 from page 468 of the textbook, which now reads: "Consider the following data on an asset: Compute the annual depreciation allowances and the resulting book values, using a) The Straight-Line (SL) depreciation method, b) Declining Balance (DB) method (without switching to SL), c) Declining Balance (DB) method (with switching to SL), and d) Sum-Of-the-Years' Digits (SOYD) method