If a sample is tested for a commodity, 36 pieces pass and 4 fail. What is the passing rate of this commodity?
抽样检验一种商品，有36件合格，4件不合格，这种商品的合格率是多少．
<gadget id="calculator">36 + 4</gadget>
<output>40</output>

<gadget id="calculator">36 / 40</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>