hot pot restaurant is engaged in promotional activities. 280 yuan per table, limited to 8 people, each additional person will be charged 29.9 yuan. How much does it cost for 12 people to eat?
某火锅店搞促销活动．每桌280元，限8人吃，每增加一人加收29.9元．12人去吃饭，需要花费多少元？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">29.9 * 4</gadget>
<output>119.6</output>

<gadget id="calculator">119.6 + 280</gadget>
<output>399.6</output>

<result>399.6</result>