How do I solve this striaght line depreciation rate problem I am confused.

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 of the xed asset is to be ignored: (a) 4 years, (b) 8 years, (c) 10 years, (d) 16 years, (e) 25 years, (1') 40 years, (9) 50 years. If required, round your answers to two decimal places. Years Percentage a. 4 years :l % b. 8 years C] % c. 10 years C] % d. 16 years C] % e. 25 years C] % r. 40 years [:] % g. 50 years :] %