Three car drivers walked into a small food store by the road. The first driver bought 4 sausages, 1 bottle of soft drink and 10 pieces of bread, and paid 16.9 yuan; the second driver bought 3 ham sausages and 1 bottle of soft drink and 7 pieces of bread, the payment is 12.6 yuan; the third driver bought 2 ham sausages, 2 bottles of soda and 2 pieces of bread, how much is the payment
三个汽车司机走进路旁的小食品店，第一个司机买了4根腿肠，1瓶汽水和10个面包，付款16.9元；第二个司机买了3根火腿肠，1瓶汽水和7个面包，付款12.6元；第三个司机买了2根火腿肠，2瓶汽水和2个面包，需付款多少元
<gadget id="calculator">16.9 - 12.6</gadget>
<output>4.3</output>

<gadget id="calculator">4.3 * 3</gadget>
<output>12.9</output>

<gadget id="calculator">16.9 - 12.9</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>