Zhang Qiang's family used to use about 16 tons of water per month. After he replaced the water-saving faucet, he used about 14 tons of water per month.
张强家原来每月用水约16吨，他换了节水龙头后每月用水约14吨，每月用水比原来节约了百分之几？
<gadget id="calculator">16 - 14</gadget>
<output>2</output>

<gadget id="calculator">2 / 16</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>