As of September 2013, my country's Long March series of launch vehicles have carried out 180 launches, of which only 9 were unsuccessful. What is the success rate of launch.
截止到2013年9月，我国长征系列运载火箭进行了180次发射，其中只有9次不成功．发射的成功率是多少．
<gadget id="calculator">180 - 9</gadget>
<output>171</output>

<gadget id="calculator">171 / 180</gadget>
<output>19/20 = around 0.95</output>

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

<gadget id="calculator">(19/20) * 1</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>