The water supply company of a certain city stipulates that the monthly water consumption of each household is within 5 tons (including 5 tons), and the fee is 3.6 yuan per ton. The part of the water consumption of each household exceeds 5 tons is 4 yuan per ton. Grandma Li's house used 9 tons of water in May, how much is the water fee payable?
某市自来水公司规定：每户每月的用水量在5吨以内(含5吨)，按每吨3.6元收费，每户用水量超过5吨的部分，按每吨4元收费．李奶奶家5月份用水9吨，应缴水费多少元．
<gadget id="calculator">3.6 * 5</gadget>
<output>18</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">18 + 16</gadget>
<output>34</output>

<result>34</result>