Straight-Line Depreciation Rates Convert each of the following estimates of useful life to a straight-line depreciation rate, stated as a percentage: (a) 10 years, (b) 8 years, (c) 25 years, (d) 40 years, (e) 5 years, (f) 4 years, (9) 20 years. If required, round your answers to one decimal place. Percentage Years 10 years 8 years 25 years 40 years 5 years 4 years 20 years a. b. C. el