Question
One textbook costs $20 at a shop. During a sale, for every 4 textbooks bought, the 5th textbook can be bought at a discount of 35% off the original price. How many textbooks does Ivan buy if he pays $412 altogether?
4 m

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One textbook costs $20 at a shop. During a sale, for every 4 textbooks bought, the 5th textbook can be bought at a discount of 35% off the original price. How many textbooks does Ivan buy if he pays $412 altogether?