We have the following information
Manufacturer A |
Manufacturer B |
|
First Cost ($) |
– 15,000 |
– 18,000 |
Annual Operating Costs ($) |
– 3,500 |
– 3,100 |
Salvage Value ($) |
1,000 |
2,000 |
Life (n) in years |
4 |
8 |
MARR (i) |
10% or 0.1 |
10% or 0.1 |
We will be using Present Worth (PW) Method
Manufacturer A
PW(10%) = – First Cost – Annual Cost(P/A, i, n) + Salvage Value(P/F, i, n)
PW(10%) = – 15,000 – 3,500(P/A, 10%, 4) + 1,000(P/F, 10%, 4)
PW(10%) = – 15,000 – 3,500[((1+0.1)4 – 1)/0.1(1+0.1)4] + 1,000/(1 + 0.1)4
PW(10%) = – 15,000 – 11,094.53 + 683.01
PW(10%) of Manufacturer A = – ($25,411.52)
Manufacturer B
PW(10%) = – First Cost – Annual Cost(P/A, i, n) + Salvage Value(P/F, i, n)
PW(10%) = – 18,000 – 3,100(P/A, 10%, 8) + 2,000(P/F, 10%, 8)
PW(10%) = – 18,000 – 3,100[((1+0.1)8 – 1)/0.1(1+0.1)8] + 2,000/(1 + 0.1)8
PW(10%) = – 18,000 – 16,538.27 + 933.01
PW(10%) of Manufacturer B = – ($33,605.26)
Based on the PW, Manufacturer A should be selected as its PW is higher compared to the PW of Manufacturer B.
Now it is given that
Manufacturer A |
Manufacturer B |
|
First Cost ($) |
– 15,000 |
– 18,000 |
Annual Operating Costs ($) |
– 3,500 |
– 3,100 |
Salvage Value ($) |
1,000 |
2,000 |
Life (n) in years |
3 |
3 |
MARR (i) |
10% or 0.1 |
10% or 0.1 |
Manufacturer A
PW(10%) = – First Cost – Annual Cost(P/A, i, n) + Salvage Value(P/F, i, n)
PW(10%) = – 15,000 – 3,500(P/A, 10%, 3) + 1,000(P/F, 10%, 3)
PW(10%) = – 15,000 – 3,500[((1+0.1)3 – 1)/0.1(1+0.1)3] + 1,000/(1 + 0.1)3
PW(10%) = – 15,000 – 8,703.98 + 751.31
PW(10%) of Manufacturer A = – ($22,952.67)
Manufacturer B
PW(10%) = – First Cost – Annual Cost(P/A, i, n) + Salvage Value(P/F, i, n)
PW(10%) = – 18,000 – 3,100(P/A, 10%, 3) + 2,000(P/F, 10%, 3)
PW(10%) = – 18,000 – 3,100[((1+0.1)3 – 1)/0.1(1+0.1)3] + 2,000/(1 + 0.1)3
PW(10%) = – 18,000 – 7,709.24 + 1,502.63
PW(10%) of Manufacturer B = – ($24,206.61)
Based on the PW, Manufacturer A should be selected as its PW is higher compared to the PW of Manufacturer B.
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