Dexcon Technologies, Inc. is evaluating two alternatives to produce its new plastic filament with tribological (i.e., low friction) properties for creating custom bearings for 3-D printers. The estimates associated with each alternative are shown below. Using a MARR of 20% per year, which alternative has the lower present worth?

Method First cost, $ M&O cost, $/year Salvage value, $ Life, years LS DDM -164,000 -370,000 -55,000 -21,000 30,000 4