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A soap bar that weighed 125 g is made 8% lighter while the price stays the same. What is the new weight?

Class 7Comparing QuantitiesComparing Quantities
  • A117 g
  • B115 g
  • C135 g
  • D10 g

Step-by-Step Solution

Reduction = 8% of g. New weight = 125 − 10 = 115 g. 117 g is the trap of subtracting 8 g because the number 8 appears in the question — 8% of 125 is 10 g, not 8 g. 135 g adds the reduction, and 10 g is the reduction on its own.
Answer: B) 115 g

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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