You need to pay 28.4 yuan to buy 10 kilograms of rice, and how much you need to pay to buy 5.4 kilograms of rice.
买10千克大米需要付28.4元，买5.4千克大米需要付多少元．
<gadget id="calculator">28.4 / 10</gadget>
<output>2.84</output>

<gadget id="calculator">2.84 * 5.4</gadget>
<output>15.336</output>

<result>15.336</result>