The experimental primary school needs to make red scarves for 2,800 students. The bottom length of each red scarf is 8 decimeters and the height is 2.5 decimeters. If one is made for each person, how many square meters of red cloth will be needed at least?
实验小学要给2800名学生做红领巾，每条红领巾的底长8分米，高是2.5分米，如果给每人做一条，至少需要多少平方米的红布？
<gadget id="calculator">2.5 / 2</gadget>
<output>1.25</output>

<gadget id="calculator">2_800 / 100</gadget>
<output>28</output>

<gadget id="calculator">8 * 1.25 * 28</gadget>
<output>280</output>

<result>280</result>