The billing method for calls to fixed-line telephones is: 2 jiao for the first 3 minutes, and 1 jiao for every additional minute thereafter. When Junjun called his father once, it took a total of 8 minutes. How much is the call fee?
拨打固定电话的计费方法是：前3分钟收费2角，以后每增加1分钟再收费1角．军军在一次打电话给爸爸时，一共用了8分钟，应付话费多少元．
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>