Master Zhang has already completed the planned (5/8) production of a batch of parts. If another 200 such parts are produced, it will exceed the original planned production by 25%. How many parts were originally planned to be produced in this batch?
张师傅生产一批零件，已经完成了计划的(5/8)，如果再生产200个这种零件，就超额了原定计划生产的25%，原计划生产这批零件多少个？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(1/4) - (5/8)</gadget>
<output>-3/8 = around -0.375</output>

<gadget id="calculator">1 + (-3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">200 / (5/8)</gadget>
<output>320</output>

<result>320</result>