There are a total of 500 parts in a batch, 20 of which are unqualified, how much are the qualified parts?
一批零件共500个，其中有20个不合格，合格零件占多少．
<gadget id="calculator">500 - 20</gadget>
<output>480</output>

<gadget id="calculator">480 / 500</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(24/25) * 1</gadget>
<output>24/25 = around 0.96</output>

<result>24/25 = around 0.96</result>