The mobile phone billing method is 0.4 yuan per minute, and less than one minute is calculated as one minute. Xiaozhao made a total of 3 phone calls one day, and the time was 6 minutes 12 seconds, 46 seconds and 3 minutes 02 seconds respectively. What is the total cost of these three calls?
手机计费方式为每分钟0.4元，不足一分钟按一分钟计算．小招有一天一共打了3次电话，时间分别是6分12秒，46秒和3分02秒，这三次的总话费是多少元．
<gadget id="calculator">7 + 1 + 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 0.4</gadget>
<output>4.8</output>

<result>4.8</result>