Yinong Airport plans to produce 600 machines in April, but actually produced 100 machines in 4 days. According to this calculation, how many machines are over-produced this month (use a ratio to solve)
一农机场四月份计划生产600台机器，实际4天就生产了100台，照这样计算，这个月超产多少台，(用比例解)
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">600 / 30</gadget>
<output>20</output>

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">5 / (1/30)</gadget>
<output>150</output>

<result>150</result>