There are about 1.2 billion people in our country. If each person saves 10 grams of grain, how many tons of grain can be saved in the whole country.
我国约有12亿人口，每人节约10克粮食，全国就可节约多少吨粮．
<gadget id="calculator">10 / 1_000_000</gadget>
<output>1/100_000 = around 0.00001</output>

<gadget id="calculator">12 * 100_000_000 * (1/100_000)</gadget>
<output>12_000</output>

<result>12_000</result>