【導讀】equipment.resources.Assetcost. Usefullife. Patternofuse. Residual(salvage)valueisthe. uponretirement.perunitofoutput.tofutureperiods.oncash.depreciablecost,usefullife,oftheasset.SYD?Depreciation=515?theperiod.numeratorbyone.SYD?Depreciation=415?calculated.Ifdouble