Question detail
If a population of fish decreased from 200 to 150, what is the percentage decrease?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Statistical skills
Question
- A. 25%
- B. 20%
- C. 30%
- D. 15%
Answer
The correct answer is 25%.
Explanation
The correct option is 25%. 25% is correct because it directly matches the approved learning objective to calculate percentage increase and percentage decrease. This belongs to Statistical skills within Statistical skills, so the answer must stay focused on the geographical process, evidence, place, or impact named by the curriculum. The other options are weaker because they move away from Statistical skills, reverse the geographical relationship, or make a broader claim than the objective supports.
Common mistake
Confusing absolute change with percentage change
Students often add or subtract the raw change to the original value instead of dividing by the original value and multiplying by 100 to find the percentage change
To calculate percentage increase or decrease, first find the absolute change (new value minus old value), then divide that change by the original value, and finally multiply by 100 to express it as a percentage.
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