On Sunday, Uncle Li checked information online, from 8:30 am to 5:15 pm, with a 3-hour break. If the Internet access fee is 0.8 yuan per hour, how much does Uncle Li need to pay for the Internet access fee in total?
星期天李叔叔上网查资料，从上午8时30分到下午5时15分，中途休息3小时．如果上网费每小时0.8元，那么李叔叔这天一共需要付上网费多少元？
<gadget id="calculator">17 - 8 - 1</gadget>
<output>8</output>

<gadget id="calculator">30 + 15</gadget>
<output>45</output>

<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 3</gadget>
<output>-9/4 = around -2.25</output>

<gadget id="calculator">8 + (-9/4)</gadget>
<output>23/4 = around 5.75</output>

<gadget id="calculator">0.8 * (23/4)</gadget>
<output>4.6</output>

<result>4.6</result>