Xiaoying and several students went to the stationery store to buy exercise books. The stationery store stipulated that if the purchase reached a certain quantity, they could buy them at the wholesale price. So they gathered together 60 yuan to buy them at the wholesale price. In this way, the number of exercise books purchased was 30 more than that purchased at the retail price. If the wholesale price of each exercise book was 45 times of the retail price, what was the retail price of each exercise book How much is it?

Suppose the retail price of each exercise book is x yuan, then the wholesale price of each exercise book is 45x, according to the meaning of the question: 6045x − 60x = 30, the solution is x = 0.5

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