Xiaohong’s house used to use about 10 tons of water per month, but now it uses about 9 tons of water per month after replacing the water-saving faucet. How much is the monthly savings compared to the original?
小红家原来每月用水约10t，现在更换节水龙头后每月用水约9t，每月比原来节约了百分之几？
<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>