Uncle Lan’s Internet access fee standard is: pay 30 yuan per month, you can surf the Internet for 50 hours, and charge 1.5 yuan for more than 50 hours. How much will I need to pay for Internet access this month when I surf the Internet for 78 hours?
蓝叔叔选择的上网收费标准是：每月交30元可以上网50时，超过50时收1.5元我这个月上网78时，需要交多少元的上网费？
<gadget id="calculator">78 - 50</gadget>
<output>28</output>

<gadget id="calculator">28 * 1.5</gadget>
<output>42</output>

<gadget id="calculator">30 + 42</gadget>
<output>72</output>

<result>72</result>