It costs 25.5 yuan to buy 10 kilograms of rice, and how much is it to buy 4 kilograms of rice.
买10千克大米用25.5元，买4千克大米用多少元．
<gadget id="calculator">25.5 / 10</gadget>
<output>2.55</output>

<gadget id="calculator">2.55 * 4</gadget>
<output>10.2</output>

<result>10.2</result>