Calculate the economic service life for each option and


A firm is considering replacing a machine that has been used drug refining process. 

The financial data for the new improved machine is as follows: 

Investment cost $27,000 (installed) 

A firm is considering replacing a machine that has been used drug refining process. 

The financial data for the new improved machine is as follows: 

Investment cost $27,000 (installed) 

Estimated useful life of 5 years 

Salvage value of $16,500 after the first year, decreasing at a rate of 12% each year. 

Operating and maintenance costs are expected to be $2,375 in the first year increasing at a rate of 45% each year. 

The financial data for the existing machine is as follows: 

Investment cost $25,000 (installed), 2 years ago 

Estimated useful life of 7 years from time of purchase 

Salvage value of $5,200 after the first year (from today), decreasing at a rate of 12% each year. 

Current market value of $13,700 

Operating and maintenance costs for the next 5 years are expected to be $2,750 in the first year increasing at a rate of 60% each year. 

With a MARR of 15%, calculate the following: 

a. Calculate the economic service life for each option.  

b. What are your conclusions?  

c. When should the defender be replaced? What are your final conclusions?  

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Finance Basics: Calculate the economic service life for each option and
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