Long-distance calls are 0.6 yuan per minute (less than 1 minute is counted as 1 minute), but after 21:00, the charge is 50% off. However, all long-distance calls exceeding 5 minutes will be charged a surcharge of 0.1 yuan per minute, and more than 10 minutes will be charged a surcharge per minute 0.2 yuan, and so on (surcharges are not discounted). Li Lu made a long-distance call to her mother at 20:59 and kept calling until 21:18:18, so how much does she have to pay for this call?
长途电话每分钟0.6元(不足1分钟以1分钟计算)，但21点以后对折收费，不过所有长途电话超过5分钟，每分钟加收附加费0.1元，超过10分钟，每分钟加收附加费0.2元，依此类推(附加费不打折)．李露20时59分给妈妈打长途电话，一直打到21时18分18秒，那么她这个电话要付多少元钱？
<gadget id="calculator">0.6 * 1</gadget>
<output>0.6</output>

<gadget id="calculator">19 / 2</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">0.6 * 1 * (19/2)</gadget>
<output>5.7</output>

<gadget id="calculator">19 * 0.2</gadget>
<output>3.8</output>

<gadget id="calculator">0.6 + 5.7 + 3.8</gadget>
<output>10.1</output>

<result>10.1</result>