In order to encourage residents to save water, the water company stipulates that each household’s monthly water consumption is less than 10 tons, and each ton will be charged at 2.8 yuan per ton. If the monthly water consumption exceeds 10 tons, the excess ton will be charged at 3.5 yuan per ton. Mingming’s family used 16 tons of water last month. How much is the water bill?
为了鼓励居民节约用水，自来水公司规定：每户月用水在10吨以内，每吨按2.8元收取，超过10吨，其超出的吨数按3.5元一吨收取．明明家上月用了16吨水，需交水费多少元？
<gadget id="calculator">10 * 2.8</gadget>
<output>28</output>

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

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

<gadget id="calculator">28 + 21</gadget>
<output>49</output>

<result>49</result>