If a building has a total economic life of 60 years and an effective age of 20 years, the remaining economic life is:
Correct Answer
B) 40 years
Remaining economic life equals total economic life minus effective age. In this case: 60 years - 20 years = 40 years of remaining economic life.
Why This Is the Correct Answer
Option B is correct because remaining economic life is calculated using the simple formula: Total Economic Life - Effective Age = Remaining Economic Life. Substituting the given values: 60 years - 20 years = 40 years. This calculation determines how many productive years the building has left before it reaches the end of its useful life. The remaining economic life is crucial for determining depreciation rates and future income potential in the cost and income approaches to value.
Why the Other Options Are Wrong
Option A: 20 years
Option A incorrectly suggests the remaining economic life equals the effective age (20 years), which would mean the building only has as many years left as it has already aged, ignoring the majority of its total economic life.
Option C: 60 years
Option C incorrectly states the remaining economic life equals the total economic life (60 years), which would ignore the fact that the building has already aged 20 years and cannot have its full original lifespan remaining.
Option D: 80 years
Option D (80 years) incorrectly adds the effective age to the total economic life instead of subtracting it, resulting in a remaining life that exceeds the building's total possible lifespan.
The Life Subtraction Rule
Remember 'TOTAL minus USED equals LEFT' - Total Economic Life minus Effective Age (years used up) equals Remaining Economic Life (years left). Think of it like a car's warranty: if you have a 10-year warranty and you've used 3 years, you have 7 years remaining.
How to use: When you see any economic life question, immediately identify the three components and apply the subtraction formula. Write down 'Total - Effective = Remaining' and plug in the known values to solve for the unknown.
Exam Tip
Always double-check that your remaining economic life answer is less than the total economic life and makes logical sense - a building cannot have more remaining life than it started with.
Common Mistakes to Avoid
- -Adding effective age to total economic life instead of subtracting
- -Confusing effective age with chronological age
- -Assuming remaining economic life equals effective age
Concept Deep Dive
Analysis
This question tests the fundamental relationship between three critical depreciation concepts in real estate appraisal: total economic life, effective age, and remaining economic life. Total economic life represents the entire useful lifespan of a building from construction to obsolescence. Effective age reflects the building's current condition relative to its chronological age, accounting for maintenance, renovations, or deterioration. Remaining economic life is the period during which the building will continue to contribute value to the property.
Background Knowledge
Economic life concepts are fundamental to the cost approach to value, particularly in calculating accrued depreciation. These calculations help appraisers determine how much value a building has lost due to physical deterioration, functional obsolescence, and external obsolescence.
Real-World Application
Appraisers use remaining economic life calculations when applying the age-life method of depreciation in the cost approach, helping determine how much depreciation to apply to the reproduction or replacement cost of improvements.
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