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In one year Meena's monthly pay rose from ₹15000 to ₹18000, while Ravi's rose from ₹20000 to ₹23600. Whose pay rose by the greater percentage?

Class 7Comparing QuantitiesComparing Quantities
  • AMeena — her pay rose by 20%, Ravi's by 18%
  • BRavi — his pay rose by ₹3600, which is more than Meena's ₹3000
  • CBoth rose by the same percentage
  • DRavi — his pay rose by 18%, Meena's by only 16.7%

Step-by-Step Solution

Meena: rise = 3000, so . Ravi: rise = 3600, so . Meena wins on percentage. The trap in the ₹3600 option is comparing the rupee rises — a bigger rise on a bigger starting pay can still be the smaller percentage. The 16.7% figure comes from dividing Meena's rise by her NEW pay instead of her old one.
Answer: A) Meena — her pay rose by 20%, Ravi's by 18%

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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