There were 2,850 students in a certain school last year, which is 20% less than last year. How many students are there in this school this year?
某校去年在校学生有2850人，今年比去年减少了20%．这个校今年在校学生有多少人．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_850 * (4/5)</gadget>
<output>2_280</output>

<result>2_280</result>