The oil yield of rapeseed is 40%, how many kg of oil can be extracted from 500kg of rapeseed.
油菜籽的出油率是40%，500kg油菜籽能榨油多少kg．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">500 * (2/5)</gadget>
<output>200</output>

<result>200</result>