Uncle Zhang used 8 tons of water last month, and the water bill was 12.8 yuan. Aunt Li’s family used 10 tons of water last month. How much is the water bill? (Solve with ratio)
张大爷上个月用水8吨，水费是12.8元，李大娘家上月用水10吨，应付水费多少元？(用比例解)
<gadget id="calculator">12.8 * 10</gadget>
<output>128</output>

<gadget id="calculator">128 / 8</gadget>
<output>16</output>

<result>16</result>