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MathNet 2026 — Part 01 Question 52

Math Olympiad Vault · MathNet 2026 — Part 01

Question 52

Inflation - Márcia is in a store buying a tape recorder she's wanted for a long time. When the cash registers the price, it exclaims: "It's not possible, you registered the number in reverse, changed the order of two digits, I remember that last week it cost less than 50 reais!" Responds the cashier: I'm sorry, but yesterday all our articles had an increase of $20\%$. What is the new recorder price?