Uncle Huang's house used to use about 10 tons of water per month. After replacing the water-saving faucet. The monthly water consumption is about 8 tons. How many percent is the monthly water saving compared to the original?
黄叔叔家原来每月用水约10吨．更换了节水龙头后．每月用水约8吨，现在每月用水比原来节约了百分之几？
<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>