Aunt Zhang used 8 tons of water last month, and the water bill was 12.8 yuan. Grandma Li used 10 tons of water at home, how much should I pay for the water? (answer with ratio)
张大妈上个月用了8吨水，水费是12.8元．李奶奶家用了10吨水，该交水费多少钱？(用比例解答)
<gadget id="calculator">10 / 8</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">12.8 * (5/4)</gadget>
<output>16</output>

<result>16</result>