Total annual cost of Alternative X -
Total cost = annual interest on investment + annual operations and maintenance + annual depreciation cost
TAC = First cost x interest rate + M&O costs + {[(FC-SV) x i]/[(1+i)n-1]}
where FC= First cost and SV = Salvage value
TAC = 1,000,000(0.10) + 380,000 + {[(1,000,000-30,000) x 0.10]/[(1+0.10)25-1]} = 100,000 + 380,000 + [97,000/9.835] = 489,862.7351
Answer = E) 490,168 AED
Total annual cost of Alternative Y -
Total cost = annual interest on investment + annual operations and maintenance + annual depreciation cost
TAC = First cost x interest rate + M&O costs + {[(FC-SV) x i]/[(1+i)n-1]}
where FC= First cost and SV = Salvage value
TAC = 990,000(0.10) + 359,500 + {[(990,000-10,000) x 0.10]/[(1+0.10)25-1]} = 99,000 + 359,500 + [98,000/9.835] = 468,464.4128
Answer = C) 468,566 AED
B/C ratio of alternative X-
B/C = Present value of benefit/Present value of cost = B{[(1+i)n-1]/[i(1+i)n]} + SV(1+i)-n / FC + M&O cost(1+i)-n = {500,000{[1+0.1)25-1]/[0.1(1+0.1)25]} + 30,000(1+0.10)-25}/ 1,000,000 + 380,000{[1+0.1)25-1]/[0.1(1+0.1)25]} = (4538520.009 + 2768.88) / 3449275.207 = 1.316 Answer = B) 1.3
B/C ratio of alternative Y-
B/C = Present value of benefit/Present value of cost = B{[(1+i)n-1]/[i(1+i)n]} + SV(1+i)-n / FC + M&O cost(1+i)-n = {459,500{[1+0.1)25-1]/[0.1(1+0.1)25]} + 10,000(1+0.10)-25}/ 990,000 + 359,500{[1+0.1)25-1]/[0.1(1+0.1)25]} = (4170899.888 + 922.96) / 3263195.887 = 1.278 Answer = B) 1.3
Incremental B/C ratio between X and Y -
Incremental first cost = FCx-FCy = 1000000-990000 = 10,000
Incremental cost per year = Cx-Cy = 380,000 - 359,500 = 20,500
Incremental benefit per year = Bx-By = 500,000 - 459,500 = 40,500
Incremental Salvage value = SVx-SVy = 30,000-10,000 = 20,000
B/C = Present value of benefit/Present value of cost = B{[(1+i)n-1]/[i(1+i)n]} + SV(1+i)-n / FC + M&O cost(1+i)-n = {40,500{[1+0.1)25-1]/[0.1(1+0.1)25]} + 20,000(1+0.10)-25}/ 10,000 + 20,500{[1+0.1)25-1]/[0.1(1+0.1)25]} = (367620.1207 + 1845.92) / 196079.3204 = 1.88 Answer - D)1.87
Which alternative should be chosen?
On calculating the incremental B/C ratio, if B/C > 1 then we chose the higher cost alternative and if B/C < 1 then we chose the lower cost alternative. Hence in this case B/C = 1.87 >1. Thus we chose Alternative X which is the higher cost alternative. Answer - G) Alternative X
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