If you buy 10kg of rice, you need to pay 56.5 yuan. How much does it cost to buy 5.4kg of the same rice?
买10kg大米需付56.5元，买5.4kg同样的大米需要多少元．
<gadget id="calculator">56.5 / 10</gadget>
<output>5.65</output>

<gadget id="calculator">5.65 * 5.4</gadget>
<output>30.51</output>

<result>30.51</result>