The price of apples is 3.5 yuan per kilogram. Mom bought 3.57 kilograms of such apples, how much should I pay?
苹果售价每千克3.5元．妈妈买了3.57千克这样的苹果，应付多少元．
<gadget id="calculator">3.5 * 3.57</gadget>
<output>12.495</output>

<result>12.495</result>