In the comprehensive practical activity, 38 students participated in the popular science exhibition. The ticket office stipulated that each ticket for one person was 10 yuan, and each ticket for ten people was 70 yuan.
在综合实践活动中，38个学生参加科普展览，售票处规定，一人券门票每张10元，十人券每张70元，他们买门票至少要多少元．
<gadget id="calculator">4 * 70</gadget>
<output>280</output>

<result>280</result>