Straight-line Depreciation Rates Convert each of the following estimates of useful life to a straight line depreciation rate, stated as a percentage, assuming that the residual value or the fixed asset is to be ignored If rounding is required, round your percentage answer to one decimal place. a. 4 years % b. 8 years c. 10 years d. 20 years % e. 25 years f. 40 years 9. 50 years