factory produced 450 tractors in April, and the production in May increased by 20% compared with April. How many tractors were produced in April and May?
某工厂四月份生产拖拉机450台，五月份比四月份增产20%，四、五两个月共生产多少台？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">450 * (6/5)</gadget>
<output>540</output>

<gadget id="calculator">540 + 450</gadget>
<output>990</output>

<result>990</result>