In the fruit shop, pears cost 2.8 yuan per kilogram, and bananas cost 1.9 yuan per kilogram. How much is a kilogram of bananas cheaper than pears?
水果店里每千克梨是2.8元，每千克香蕉是1.9元，每千克香蕉比梨便宜多少元？
<gadget id="calculator">2.8 - 1.9</gadget>
<output>0.9</output>

<result>0.9</result>