Question

In: Economics

Consider the following two alternatives that have no salvage value: A B Initial Cost $15,000 $5,100...

Consider the following two alternatives that have no salvage value:

A B
Initial Cost $15,000 $5,100
Uniform Annual Benefits $3,000 $1,800
Useful life, in years 8 4

a) If the MARR is 10%, which alternative is preferred?

b) Determine the ranges of MARR rate within which 1) A is preferred; 2) B is preferred and 3) Neither alternative should be chosen. Justify your answer through rate of return and incremental analysis.

Solutions

Expert Solution

Calculating the annual worth of the two alternatives.

Calculating the AW of alternative A.

Now calculation the AW of alternative B.

At a rate of 10% alternative B will be preferred.

B. Refer the calculation done using excel function

Calculating the IRR of alternative A manually

The net present worth of alternative A can be written as

Assume rate = 11%

Now assuming rate = 12%

Now, applying linear interpolation we get

Similarly, we can calculate the IRR of alternative B. The NPW of the alternative B can be expressed as (Note for 4 years as well as 8 years the IRR would remain same).

Assume rate = 15%

Now, assume rate = 16%

Now applying linear interpolation

Similarly we can determine the incremental IRR using the manual method. The NPW can be expressed as

Assume the rate = 10%

Now assume rate = 9%

Now applying linear interpolation we get

When MARR is equal to 10% then alternative B will be preferred.

When MARR = 9%, then alternative A will be preferred.

Alternative A will be preferred when MARR is less than 11.81%.

Alternative B will be preferred when MARR is less than 15.38%.

When the MARR is greater 15.38% then no alternative will be selected.

In terms of incremental IRR when MARR is less than 9.96% then A will be preferred. When MARR is greater than equal to 9.96% then alternative B will be selected.

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