Question
One guide book costs $10 at a shop. During a sale, for every 3 guide books bought, the 4th guide book can be bought at a discount of 10% off the original price. How many guide books does Zeph buy if he pays $225 altogether?
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One guide book costs $10 at a shop. During a sale, for every 3 guide books bought, the 4th guide book can be bought at a discount of 10% off the original price. How many guide books does Zeph buy if he pays $225 altogether?