A batch of products has 98 qualified products and 2 defective products. What is the defective rate of this batch of products?
一批产品有98个合格，2个次品，这批产品的次品率是多少．
<gadget id="calculator">98 + 2</gadget>
<output>100</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

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

<gadget id="calculator">(1/50) * 1</gadget>
<output>1/50 = around 0.02</output>

<result>1/50 = around 0.02</result>