Processing 400 parts, there are 2 rejects after inspection, what is the passing rate?
加工400个零件，经检验有2个废品，合格率为多少．
<gadget id="calculator">400 - 2</gadget>
<output>398</output>

<gadget id="calculator">398 / 400</gadget>
<output>199/200 = around 0.995</output>

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

<gadget id="calculator">(199/200) * 1</gadget>
<output>199/200 = around 0.995</output>

<result>199/200 = around 0.995</result>