The automobile factory plans to produce 200 buses a month. 69 vehicles were produced in 9 days. According to this calculation, how much can the production increase in April?
汽车厂计划一个月生产大客车200辆．9天生产了69辆，照这样计算，四月份可以增产百分之几？
<gadget id="calculator">69 / 9</gadget>
<output>23/3 = around 7.666667</output>

<gadget id="calculator">(23/3) * 30</gadget>
<output>230</output>

<gadget id="calculator">230 - 200</gadget>
<output>30</output>

<gadget id="calculator">30 / 200</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>