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In a coffee shop, the price of coffee increased from 250 to 300

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In a coffee shop, the price of coffee increased from 250 to 300. As a result, the sold quantity decreased by 100 units. At the same time, the sold quantity of cheesecake decreased by 40 pieces. The price of the cheesecake was unchanged: 300. Before the price increase, the total revenue from the cheesecake was 30,000 How much is the cross-price elasticity of cheesecake to the price change of coffee? (number, 2 decimals, indicate with ","sign if it is negative, e.g.-9.99) According to the previous result, the two goods are
In a coffee shop, the price of coffee increased from 250 to 300. As a result, the sold quantity decreased by 100 units. At the same time, the sold quantity of cheesecake decreased by 40 pieces. The price of the cheesecake was unchanged: 300. Before the price increase, the total revenue from the cheesecake was 30,000 How much is the cross-price elasticity of cheesecake to the price change of coffee? indicate with sign if it is negative, e.g. -9.99) (number, 2 decimals, According to the previous result, the two goods are a