Question
One colouring book costs $10 at a shop. During a sale, for every 4 colouring books bought, the 5th colouring book can be bought at a discount of 10% off the original price. How many colouring books does Bobby buy if he pays $412 altogether?
4 m

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One colouring book costs $10 at a shop. During a sale, for every 4 colouring books bought, the 5th colouring book can be bought at a discount of 10% off the original price. How many colouring books does Bobby buy if he pays $412 altogether?