Uncle Li still has 25 yuan of pre-stored calls in his mobile phone this month. If 1 yuan can be used for 5.2 minutes, Uncle Li’s monthly call time is 7 hours and 48 minutes.
李叔叔手机里这个月还剩25元钱的预存话费，如果1元可打5.2分钟，李叔叔每月打电话时间7小时48分钟，李叔叔这个月至少还要预存话费多少钱？
<gadget id="calculator">468 / 5.2</gadget>
<output>90</output>

<gadget id="calculator">90 * 1</gadget>
<output>90</output>

<gadget id="calculator">90 - 25</gadget>
<output>65</output>

<result>65</result>