A building has an actual age of 20 years and an effective age of 15 years. If the total economic life is 50 years, what is the remaining economic life?
Correct Answer
B) 35 years
Remaining economic life is calculated as total economic life minus effective age. In this case: 50 years - 15 years = 35 years remaining economic life.
Why This Is the Correct Answer
Option B is correct because remaining economic life is calculated by subtracting the effective age from the total economic life. The building has an effective age of 15 years, meaning it appears and functions as if it were only 15 years old despite being actually 20 years old. With a total economic life of 50 years, the remaining economic life is 50 - 15 = 35 years. This calculation reflects the building's actual condition and expected future utility rather than just its chronological age.
Why the Other Options Are Wrong
Option A: 30 years
Option A incorrectly uses actual age instead of effective age in the calculation (50 - 20 = 30 years), which fails to account for the building's superior condition that makes it function as if it were younger than its chronological age.
Option C: 45 years
Option C appears to subtract only 5 years from the total economic life, which has no basis in the given data and doesn't follow any recognized depreciation calculation method.
Option D: 50 years
Option D suggests the building has its full economic life remaining, which would only be true if the effective age were zero, meaning the building was brand new or completely renovated to new condition.
TREE Formula
TREE: Total minus Remaining equals Effective. Rearranged: Total minus Effective equals Remaining. Think of a tree's remaining life - you look at how healthy it appears (effective age), not just when it was planted (actual age).
How to use: When you see remaining economic life questions, immediately identify the TREE components: find Total economic life, subtract Effective age (not actual age), and you get Remaining economic life.
Exam Tip
Always use effective age, not actual age, for remaining economic life calculations - the exam often includes both ages as a distractor.
Common Mistakes to Avoid
- -Using actual age instead of effective age in the calculation
- -Confusing remaining economic life with remaining physical life
- -Adding effective age to total economic life instead of subtracting
Concept Deep Dive
Analysis
This question tests the fundamental concept of remaining economic life in real estate appraisal, which is critical for depreciation calculations in the cost approach. The key distinction here is understanding that remaining economic life is based on effective age (how old the building appears to be based on its condition and maintenance) rather than actual age (chronological age since construction). This concept is essential because two buildings of the same actual age can have vastly different remaining economic lives based on their maintenance, renovations, and overall condition. The calculation requires understanding that total economic life represents the entire useful life span of a building from new construction to the end of its economic usefulness.
Background Knowledge
Effective age represents the age of a building based on its condition, maintenance, and functionality rather than when it was built, while actual age is simply the chronological time since construction. Total economic life is the estimated period during which a building contributes to property value, and remaining economic life is the future period of economic usefulness.
Real-World Application
An appraiser evaluating a well-maintained 1980s office building might find it has an effective age of 10 years due to recent renovations, even though its actual age is 40+ years, significantly affecting depreciation calculations and final value estimates.
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