A factory processes a batch of products, 390 are qualified and 10 are unqualified, what is the pass rate?
某厂加工一批产品有390个合格，10个不合格，合格率多少．
<gadget id="calculator">390 + 10</gadget>
<output>400</output>

<gadget id="calculator">390 / 400</gadget>
<output>39/40 = around 0.975</output>

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

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>