Dongfeng Machine Tool Factory produced 400 machine tools in April, which was 1/5 more than in April. How many machine tools were produced in May?
东风机床厂四月份生产机床400台，五月份比四月份增产(1/5)．五月份生产机床多少台？
<gadget id="calculator">1 / 5</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">400 * (6/5)</gadget>
<output>480</output>

<result>480</result>