Uncle Zhang chooses the internet charging standard: pay 35 yuan per month to surf the Internet for 50 hours, and charge 1.5 yuan per hour for more than 50 hours. Uncle Zhang will surf the Internet for 72 hours this month. How much is the internet fee?
张叔叔选择的上网收费标准是：每月交35元可以上网50小时，超过50小时，每小时收1.5元，张叔叔这个月上网72小时，需要交多少元的上网费？
<gadget id="calculator">72 - 50</gadget>
<output>22</output>

<gadget id="calculator">22 * 1.5</gadget>
<output>33</output>

<gadget id="calculator">33 + 35</gadget>
<output>68</output>

<result>68</result>