The chemical fertilizer factory produced 440 tons of chemical fertilizers in January, 20% less than in February, and the output in two months just accounted for 45% of the annual output. How many tons of chemical fertilizers are produced in a year?
化肥厂一月份生产化肥440吨，比二月份少20%，两个月的产量正好占全年产量的45%．全年生产化肥多少吨？
<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">440 / (4/5)</gadget>
<output>550</output>

<gadget id="calculator">550 + 440</gadget>
<output>990</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">990 / (9/20)</gadget>
<output>2_200</output>

<result>2_200</result>