Xiao Ming practiced shooting. He shot 20 balls and missed 2 of them. Find his hit rate in this exercise.
小明进行投篮练习，他投了20个球，有2个没有投中．求他这次练习的命中率．
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>