For the given projects with useful life equals six years. Find best alternative using Incremental Present Worth with MARR = 18%. Project A B Investment cost $10,000 C $8,000 $6,000 $12,000 Estimated units to be sold per year 5,000 2,000 5.000 1,000 Selling price $/unit $2 $3.5 $1.5 $6 Variable cost $/unit $1 $0.75 $0.3 $1.5 Annual Expenses (fixed) $/year Salvage Value $2,000 $3,000 $4,500 $1,000 $200 $1,000 $300