- AShop B, by ₹ 3
- BSame price at both
- CShop A, by ₹ 30
- DShop A, by ₹ 3
Step-by-Step Solution
Shop A: buy 2, get the 3rd free . Shop B: , 30% off . Shop A is cheaper by ₹ 3.
Answer: D) Shop A, by ₹ 3
Riya needs exactly 3 gel pens. The posters of two shops are shown. Which shop is cheaper for her, and by how much?
Class 7Comparing QuantitiesComparing Quantities
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.
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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