There were 2,400 pupils in Guangming Primary School last year, which is 10% less than last year. How many primary school students are there this year?
光明小学去年有小学生2400人，今年比去年减少了10%．今年有小学生多少人？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">2_400 * (9/10)</gadget>
<output>2_160</output>

<result>2_160</result>