Professor Li did a germination test for a batch of seeds. He took 120 seeds for the first time, and 90 of them germinated; he took 30 seeds for the second time, and all of them germinated. What is the germination rate of this batch of seeds?
李教授为一批种子做发芽试验，第一次取了120粒，有90粒发芽；第二次取30粒，全部发芽．这批种子的发芽率是多少？
<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<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>