A rice field is 500 meters long and 300 meters wide, and the rice harvested per square meter is 0.9 kilograms. How many tons of rice are harvested in this rice field?
一块稻田长500米，宽300米，每平方米收稻谷0.9千克，这块稻田共收稻谷多少吨？
<gadget id="calculator">0.9 / 1_000</gadget>
<output>0.0009</output>

<gadget id="calculator">500 * 300 * 0.0009</gadget>
<output>135</output>

<result>135</result>