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Engineering economy
5. Beckman Technologies, plans to purchase a precision laboratory equipment. Two manufacturers offered the estimates shown be
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Answer #1

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.

A Manufacturer 1000 1 2 . mt 14 3500 3500 3500 3500 15,000

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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