10 of a batch of parts are unqualified after inspection, and the pass rate is 97.5%. How many of the parts in this batch are qualified?
一批零件经经检有10个不合格，合格率是97.5%，这批零件中合格的有多少个．
<gadget id="calculator">97.5 / 100</gadget>
<output>0.975</output>

<gadget id="calculator">1 - 0.975</gadget>
<output>0.025</output>

<gadget id="calculator">10 / 0.025</gadget>
<output>400</output>

<gadget id="calculator">400 - 10</gadget>
<output>390</output>

<result>390</result>