In order to encourage urban residents to save water, the water company stipulates that each person will be charged 1.2 yuan per ton for water consumption within 2 tons (including 2 tons) per month, and 5 yuan per ton for the excess water. The 4 members of Lili's family shared 15 tons of water last month. How much should they pay for water?
为鼓励城市居民节约用水，自来水公司规定：每人每月用水2吨内(含2吨)，按1.2元一吨收费，超过部分按5元一吨收费．丽丽家4口人，上月共用水15吨，应交水费多少钱？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">8 * 1.2</gadget>
<output>9.6</output>

<gadget id="calculator">35 + 9.6</gadget>
<output>44.6</output>

<result>44.6</result>