water supply company in a certain city charges water fees by monthly segmented billing. The fee is 2.5 yuan per ton for less than 10 tons, and 3.5 yuan per ton for the part exceeding 10 tons. Xiao Ming’s family uses 16 tons of water in July. What is the water fee payable? Yuan?
某市自来水公司按月分段计费的方法收取水费，10吨以内的每吨收费2.5元，超过10吨的部分每吨收费3.5元，小明家七月用水16吨，应缴水费多少元？
<gadget id="calculator">2.5 * 10</gadget>
<output>25</output>

<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<gadget id="calculator">3.5 * 6</gadget>
<output>21</output>

<gadget id="calculator">25 + 21</gadget>
<output>46</output>

<result>46</result>