Question
One colouring book costs $20 at a shop. During a sale, for every 5 colouring books bought, the 6th colouring book can be bought at a discount of 10% off the original price. How many colouring books does Billy buy if he pays $394 altogether?
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One colouring book costs $20 at a shop. During a sale, for every 5 colouring books bought, the 6th colouring book can be bought at a discount of 10% off the original price. How many colouring books does Billy buy if he pays $394 altogether?