Comparing Quantities
"Comparing Quantities" here isn't about calculating faster — every question below is two people disagreeing about WHY an answer is right, not just what it is.
A shop board says: "20% off, then an extra 10% off on that." Geeta says that makes 30% off in total. The shopkeeper is smiling. Is Geeta right?
A price first went up 50%, then next month came down 50%. Ravi says the price is back to what it was at the start. Is Ravi right?
Reena scored 15 out of 20, Raju 30 out of 50. Raju says he did better than Reena because he has 30 marks and she has only 15. Judging by marks alone, is Raju right?
Ram says if Aman has 50% more money than Sohan, then Sohan has 50% less than Aman — the two are the same statement. Is Ram right?
A shopkeeper cut the price by 20%. To bring it back to the old price, he raises that reduced price by 20%. Ravi says the price is back to what it was. Is Ravi right?
A shop earned ₹0 last year (it was shut). This year it earned ₹50,000. The owner says earnings grew 100%. Is stating a rise from zero as a percentage meaningful?
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