The incremental External Rate of Return (ERR) between Beta and Gamma (second decimal; no rounding) is a) 10.02%; b) 10.19%; c) 10.58%; d) 11.13%.

The owner of a seniors' residence is planning the purchase an electrical generator to minimize the discomfort due to electrical power outages. The key parameters of the three advertising campaigns are provided below. Project Parameters 1. Initial Cost ($ Beta 700,000 600,000 at EOY1 770,000 at EOY1900,000 at EOY1 decreasing by 2% | Increasing by | Increasing by 1% 5,000 annually thereafter. 400,000 at EOY1 572,000 at EOY1 640,000 at EOY1 increasing by 1% annually thereafter. Alpha 600,000 Gamma 800,000 2. Revenues (S) annually thereafter. annually thereafter increasing by 4,000 annually thereafter. increasing by 40,000 annually thereafter 3. Operating Costs 4. End-of-life salvage 5. Useful life (vears 15,000 10,000 value ($ 10 Industry Standard = 4 years MARR 1 0%