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A train without stoppage travels with an average speed of 65 km/h and with stoppage, it travels with an average speed of 52 km/h. For how many minutes does the train stop on an average per hour?

A shopkeeper allows 18% discount on the marked price of an article and still makes a profit of 23%. If he gains `18.40 on the sale of the article, then what is the marked price of the article?