Aunt Zhang’s family used 8 tons of water last month, and the water bill was 28 yuan. Grandma Li used 10 tons of water at home. How much was the water bill for Grandma Li's house last month? (Solution with proportional knowledge)
张大妈家上个月用了8t水，水费是28元．李奶奶家用了10t水．李奶奶家上个月的水费是多少钱？(用比例知识解)
<gadget id="calculator">10 / 8</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">28 * (5/4)</gadget>
<output>35</output>

<result>35</result>