4. Which equipment is preferred if the firm’s interest rate is 9%? In PW terms how great is the difference?
Alternative: Equipment A Equipment B
First Cost: $55,000 $25,000
Annual O & M 3,900 4,200
Salvage Value 0 5000
Overhaul (Year 6) 10000 Not required
Life, in years. 10 5
i = 9%,
The present worth analysis will be carried out for 10 (LCM of 10 & 5)
PW of Equipment A = -55000 -3900*(P/A,9%,10)-10000*(P/F,9%,6)
= -55000 -3900*6.417657 -10000*0.596267
= -85991.54
Equipment B will be reinvested in EOY 5 and csh flow will be repeated from EOY 6 to EOY10
PW of Equipment B = -25000 - 4200*(P/A,9%,10) + 5000*(P/F,9%,5) - 25000*(P/F,9%,5) + 5000*(P/F,9%,10)
= -25000 - 4200*6.417657 - 20000*0.649931 + 5000*0.422410
= -62840.73
Equipment B should be seleced as it has less present cost by 23150.81 as compared to equipment A
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