A certain clothing with an original price of 1,000 yuan has been reduced twice in a row to 720 yuan. It is known that the percentage of the second price reduction is twice that of the first one. Find the second price reduction rate.
某种原价1000元的服装连续两次降价，降为720元，已知第二次降价的百分率是第一次的2倍，求第二次的降价率．
<gadget id="calculator">0.1 * 2</gadget>
<output>0.2</output>

<result>0.2</result>