UNDERSTAND · PRACTISE · REVIEW
Percentage change uses the original value as its base. The same rupee movement can represent a different percentage when the starting value changes. State the base explicitly.
A worked example
Try this learning routine
- Read the explanation and say the idea in your own words.
- Cover the worked answer and attempt a similar question.
- Check each step, including units or word meaning.
- Record one mistake and retry a new example later.
Independent practice
Choose one answer for each question and write a reason. These are foundation activities, not a complete board examination.
A price rises from ₹10 to ₹12. Percentage increase?
A price rises from ₹20 to ₹24. Percentage increase?
A price rises from ₹30 to ₹36. Percentage increase?
A price rises from ₹40 to ₹48. Percentage increase?
A price rises from ₹50 to ₹60. Percentage increase?
A price rises from ₹60 to ₹72. Percentage increase?
Answers and explanations
- 20% — Increase/original × 100 = 2/10 × 100 = 20%.
- 20% — Increase/original × 100 = 4/20 × 100 = 20%.
- 20% — Increase/original × 100 = 6/30 × 100 = 20%.
- 20% — Increase/original × 100 = 8/40 × 100 = 20%.
- 20% — Increase/original × 100 = 10/50 × 100 = 20%.
- 20% — Increase/original × 100 = 12/60 × 100 = 20%.
Your next step
Use the same idea in a fresh example. Bring the method and your questions to a discussion with TRICEF, rather than relying on a score alone.
Original TRICEF Academy practice material. Not an official board paper. Open the answer section before printing if you want the answer key included.