The apples in the market are 2.8 yuan per kilogram. How much does it cost my mother to buy 3.5 kilograms?
市场上苹果每千克2.8元，妈妈买3.5千克花了多少元钱．
<gadget id="calculator">3.5 * 2.8</gadget>
<output>9.8</output>

<result>9.8</result>