Question
One story book costs $16 at a shop. During a sale, for every 5 story books bought, the 6th story book can be bought at a discount of 25% off the original price. How many story books does Brandon buy if he pays $324 altogether?
4 m

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One story book costs $16 at a shop. During a sale, for every 5 story books bought, the 6th story book can be bought at a discount of 25% off the original price. How many story books does Brandon buy if he pays $324 altogether?