ANSWER:
A)
1) Alternative a:
aw of benefits = annual benefit = 30,500,000
aw of costs = annual operation and maintenance cost + initial cost(a/p,i,n)
aw of costs = 200,000 + 150,000,000(a/p,9%,11)
aw of costs = 200,000 + 150,000,000 * 0.1469
aw of costs = 200,000 + 22,035,000
aw of costs = 22,235,000
b/c ratio = aw of benefits / aw of costs = 30,500,000 / 22,235,000 = 1.37
so the b/c ratio is 1.37
2) Alternative b:
aw of benefits = annual benefit = 38,100,000
aw of costs = annual operation and maintenance cost + initial cost(a/p,i,n)
aw of costs = 360,000 + 250,000,000(a/p,9%,10)
aw of costs = 360,000 + 250,000,000 * 0.1558
aw of costs = 360,000 + 38,950,000
aw of costs = 39,310,000
b/c ratio = aw of benefits / aw of costs = 38,100,000 / 39,310,000 = 0.97
so the b/c ratio is 0.97
3) Alternative c:
aw of benefits = annual benefit = 26,400,000
aw of costs = annual operation and maintenance cost + initial cost(a/p,i,n)
aw of costs = 330,000 + 200,000,000(a/p,9%,12)
aw of costs = 330,000 + 200,000,000 * 0.1397
aw of costs = 330,000 + 27,940,000
aw of costs = 28,270,000
b/c ratio = aw of benefits / aw of costs = 26,400,000 / 28,270,000 = 0.93
so the b/c ratio is 0.93
so the best alternative is alternative a as the best alternative has the b/c ratio more then 1.
B) Since alternative a has the lowest initial cost and lowest annual cost , it makes as the best alternative and supported by the fact that the b/c ratio of alternative is more then 1 as when we select any alternative a we look for lower costs and higher benefits and this alternative a has lowest costs out of the three alternatives.
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