A workshop plans to produce 500 parts in July, but actually completed 45% in the first half of the month. Now, to make the actual output overfulfill by 15%, how many parts must be produced in the second half of the month?
一个车间计划7月份生产500个零件，实际上半月完成了45%，现在要使实际产量超额完成15%，下半月还必须生产多少个零件？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(11/20) + (3/20)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">500 * (7/10)</gadget>
<output>350</output>

<result>350</result>