Incremental Benefit Cost Analysis Example B C 174 180 136 4 60 10 Costs 100 120 90 B–D 1. 7 Benefits Disbenefits C D Not Feasible A E F 80 136 178 89 8 10 2 14 80 70 110 50 1. 4 0. 9 1. 8 Cost Order: G E C A F B G – DN: (From feasibility, (B – D) / C = 1. 5 E – G: (136 – 89) – (10 – 14) = 51 = 2. 55 (70 – 50) C – E: A – E: Upgrade to G Upgrade to E Keep Proj. E 20 (174 – 136) – (4 – 10) = 44 = 1. 47 (100 – 70) 1. 5 20 (136 – 136) – (10 – 10) = 0 (90 – 70) 1. 6 G 30 Upgrade to A
Incremental Benefit Cost Analysis Example B C 174 180 136 4 60 10 Costs 100 120 90 B–D 1. 7 Benefits Disbenefits C F – A: E F 80 136 178 89 8 10 2 14 80 70 110 50 1. 4 0. 9 1. 8 Cost Order: G E C A F B (178 – 174) – (2 – 4) = 6 = 0. 6 (110 – 100) B – A: D Not Feasible A 1. 5 Keep Proj. A 10 (180 – 174) – (60 – 4) = – 50 = – 2. 5 (120 – 100) 1. 6 G 20 Best is Proj A
Bonus Problem: B/C Build-Up Example Snack Fridge Viability Data: 110 IE & Eng. M students 48% will use snack fridge instead of going home Users average (2) drinks & (1) snack each week Mark-up is 10%, drink price is $. 50, snacks $. 75 School year averages 32 weeks Fridge costs $495, lasts 8 yrs, 8% cpd annually If they save time & $$ on snacks & drinks, they can buy books , study more, and expect one of them to win a $5 500 national scholarship every 4 years. But the vending company will quit donating $300 per year to their Tech Society Perform a B/C analysis – IE student perspective
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