In September, Xiaoming’s family used 16.8 tons of water, 36.5 degrees of electricity, 0.42 yuan per kilowatt-hour of electricity, and 1.2 yuan per ton of water. Please calculate how much water and electricity bills his family should pay in September?
小明家九月份用水16.8吨，用电36.5度，每度电0.42元，每吨水1.2元，请你算一算他家九月份应交水电费多少元？
<gadget id="calculator">16.8 * 1.2</gadget>
<output>20.16</output>

<gadget id="calculator">36.5 * 0.42</gadget>
<output>15.33</output>

<gadget id="calculator">20.16 + 15.33</gadget>
<output>35.49</output>

<result>35.49</result>