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The price of a laptop was cut from ₹45000 to ₹38250. Find the percentage decrease.

Class 7Comparing QuantitiesComparing Quantities
  • A15%
  • B17.65%
  • C85%
  • D6.75%

Step-by-Step Solution

Decrease = 45000 − 38250 = ₹6750. Percentage decrease = . 17.65% divides by the reduced price instead of the original one. 85% is — that is what the new price IS as a percentage of the old, not how much it fell. 6.75% just re-reads the rupee drop as a percentage.
Answer: A) 15%

Key idea: Three forms of the same number

Fractions, decimals, and percentages are three notations for the same idea. Convert freely:

- **Fraction → percentage**: multiply by 100. .
- **Percentage → fraction**: divide by 100 and simplify. .
- **Decimal → percentage**: shift two places right. 0.34 = 34%.
- **Percentage → decimal**: shift two places left. 8% = 0.08.

With practice, this becomes automatic and you can move between forms without thinking.

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