The school library originally had 2,500 books, but after moving into the new school, it has increased by 80%. How many books are there in the library now?
学校图书室原有图书2500册，搬入新学校后，增加了80%，现在图书室有图书多少册？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">2_500 * (9/5)</gadget>
<output>4_500</output>

<result>4_500</result>