Xiaodong used 500 seeds to germinate, and 45 did not germinate. Find the germination rate of this batch of seeds.
小东用500粒种子发芽试验，有45粒不发芽，求这批种子的发芽率．
<gadget id="calculator">500 - 45</gadget>
<output>455</output>

<gadget id="calculator">455 / 500</gadget>
<output>91/100 = around 0.91</output>

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

<gadget id="calculator">(91/100) * 1</gadget>
<output>91/100 = around 0.91</output>

<result>91/100 = around 0.91</result>