A batch of parts, 120 qualified products, 30 waste products, what is the pass rate of the products?
一批零件，合格产品120个，废品30个，产品的合格率是多少．
<gadget id="calculator">120 + 30</gadget>
<output>150</output>

<gadget id="calculator">120 / 150</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>