In: Economics
Please show all steps:
What is the economic life of an asset that was purchased for $12,000. O&M costs are $3000 for the first year and increase $1500/yr each year after that. Assume a 7% interest rate.
As salvage value is not given in question, it is assumed to be 0
EUAC for 1 yr of operation = 12000*(A/P,7%,1) + 3000
= 12000*1.07 + 3000
= 15840
EUAC for 2 yr of operation = 12000*(A/P,7%,2) + 3000 + 1200*(A/G,7%,2)
= 12000*0.553092 + 3000 + 1200*0.483092
= 10361.74
EUAC for 3 yr of operation = 12000*(A/P,7%,3) + 3000 + 1200*(A/G,7%,3)
= 12000*0.381052 + 3000 + 1200*0.954929
= 9005.01
EUAC for 4 yr of operation = 12000*(A/P,7%,4) + 3000 + 1200*(A/G,7%,4)
= 12000*0.295228 + 3000 + 1200*1.415536
= 8666.04
EUAC for 5 yr of operation = 12000*(A/P,7%,5) + 3000 + 1200*(A/G,7%,5)
= 12000*0.243891 + 3000 + 1200*1.864950
= 8724.11
EUAC for 6 yr of operation = 12000*(A/P,7%,6) + 3000 + 1200*(A/G,7%,6)
= 12000*0.209796 + 3000 + 1200*2.303217
= 8972.38
As EUAC has started rising, it will keep increasing if we increase yr of operation
Minimum EUAC = 8666.04 at 4 yr of operation
Economic service life = 4 yrs