Question
One story book costs $20 at a shop. During a sale, for every 3 story books bought, the 4th story book can be bought at a discount of 10% off the original price. How many story books does Nick buy if he pays $216 altogether?
4 m

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One story book costs $20 at a shop. During a sale, for every 3 story books bought, the 4th story book can be bought at a discount of 10% off the original price. How many story books does Nick buy if he pays $216 altogether?