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Seven identical notebooks cost ₹252. At the same rate, what will 11 such notebooks cost?

Class 7Comparing QuantitiesComparing Quantities
  • A₹360
  • B₹396
  • C₹256
  • D₹2772

Step-by-Step Solution

Unitary method: first find the cost of ONE notebook, then scale up. One notebook costs . Eleven notebooks cost . ₹2772 is — multiplying the cost of seven notebooks by 11 skips the "cost of one" step. ₹256 comes from adding the 4 extra notebooks as ₹4 instead of 4 × ₹36.
Answer: B) ₹396

Key idea: Reading the question carefully

Three things to check before you compute:

1. **What's being asked?** Profit % needs CP and SP. SI needs P, R, T.
2. **What units are the inputs in?** Time in months → convert to years (divide by 12). Rate already per annum → leave it.
3. **What's the base of the percentage?** Profit/loss % is on COST price, not selling price. Discount % is on MARKED price, not on what you actually paid.

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