Two square fields: one has area 1 hectare (10,000 m^2). The other square’s side is larger by 1%. Find the difference in their areas (in square meters).
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A101 sq. metres
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B201 sq. metres
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C100 sq. metres
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D200 sq. metres
Answer
Correct Answer: 201 sq. metres
Explanation
Introduction / Context:When side length scales, area scales with the square of that factor. If the side increases by 1%, the area multiplies by (1.01)^2. The difference from the original area is then the “excess” due to squaring the side factor.
Given Data / Assumptions:
- Area of square S1 = 1 hectare = 10,000 m^2
- Side of S2 is 1% larger ⇒ area factor = (1.01)^2 = 1.0201
Concept / Approach:Compute area of the larger square S2 = 1.0201 × 10,000 = 10,201 m^2. The difference S2 − S1 equals 201 m^2, which is the required answer.
Step-by-Step Solution:S2 area = 10,000 × 1.0201 = 10,201 m^2Difference = 10,201 − 10,000 = 201 m^2
Verification / Alternative check:Approximation: doubling 1% linearly would suggest ~2% area increase; exact value is 2.01%, which on 10,000 yields 201 — matching the computation.
Why Other Options Are Wrong:100 and 200 m^2 reflect 1% or 2% approximations without compounding; 101 m^2 mixes percentage of side with area incorrectly.
Common Pitfalls:Adding percentages linearly for area; remember area depends on side squared, so apply the square of the scale factor.
Final Answer:201 sq. metres