Question
One guide book costs $20 at a shop. During a sale, for every 6 guide books bought, the 7th guide book can be bought at a discount of 25% off the original price. How many guide books does Pierre buy if he pays $290 altogether?
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One guide book costs $20 at a shop. During a sale, for every 6 guide books bought, the 7th guide book can be bought at a discount of 25% off the original price. How many guide books does Pierre buy if he pays $290 altogether?