Master Wang has processed a batch of parts, and has already completed (2/5) of the total. If he processes 160 more parts, it will exceed 20%. How many parts will Master Wang plan to process?
王师傅加工一批零件，已经完成了总数的(2/5)，如果再加工160个就超过了20%，王师傅计划要加工多少个零件？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/5) - (2/5)</gadget>
<output>-1/5 = around -0.2</output>

<gadget id="calculator">1 + (-1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 / (4/5)</gadget>
<output>200</output>

<result>200</result>