A salt pond produces 2.1 grams of salt from 100 grams of seawater. According to this calculation, if 300,000 tons of seawater is put in at a time, how many tons of salt can be produced in total?
一个盐池从100克海水里晒出2.1克盐，照这样计算，一次放入海水30万吨，共可晒出盐多少万吨？
<gadget id="calculator">2.1 / 100</gadget>
<output>0.021</output>

<gadget id="calculator">0.021 * 30</gadget>
<output>0.63</output>

<result>0.63</result>