Question
One story book costs $10 at a shop. During a sale, for every 5 story books bought, the 6th story book can be bought at a discount of 20% off the original price. How many story books does Seth buy if he pays $378 altogether?
4 m

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One story book costs $10 at a shop. During a sale, for every 5 story books bought, the 6th story book can be bought at a discount of 20% off the original price. How many story books does Seth buy if he pays $378 altogether?