Ans:
Calculating PW for each machine:
MARR : 10%
Inflation : 3%
Required rate of return : 10+3 = 13%
Machine X:
First Cost : $220,000
Annual Operating Cost : $20,000
Annuity Factor @13% for 8 Years : 1/(1.13)^1 + 1/(1.13)^2 + 1/(1.13)^3 + .........1/(1.13)^8 = 4.79877
Present value of Annual Operating costs : $20,000 * 4.79877 = $95,975
Present value Cost of Machine X : $220,000 + $95,975 = $315,975
Machine Y:
First Cost : $150,000
Annual Operating Cost : $45,000
Annuity Factor @13% for 8 Years : 1/(1.13)^1 + 1/(1.13)^2 + 1/(1.13)^3 + .........1/(1.13)^8 = 4.79877
Present value of Annual Operating costs : $45,000 * 4.79877 = $215,945
Present value Cost of Machine Y : $150,000 + $215,945 = $365,945
So cost of Machine X is low. Machine X is better.
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