Two tons of rapeseed can be ground to produce 800 kg of rapeseed oil. What is the oil yield of this type of rapeseed?
两吨油菜籽可以磨出菜油800千克，该种油菜籽的出油率是多少．
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">800 / 2_000</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>