my country is one of the countries with poor water resources. If each person saves (2/5) kilograms of water per day, how many tons of water will be saved in total for 1 million people in the city every month (based on 30 days)?
我国是水资源贫乏的国家之一，如果每人每天节约(2/5)千克的水，全市100万人每个月(按30天计算)，共节约多少吨水？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1_000 * 1_000</gadget>
<output>1_000_000</output>

<gadget id="calculator">30 / 1_000</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">(2/5) * 1_000_000 * (3/100)</gadget>
<output>12_000</output>

<result>12_000</result>