A piece of clothing is 20% off for the first time and 10% off for the second time. The current price is 180 yuan. What is the original price?
一件衣服第一次打八折，第二次打九折，现价是180元，原价是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">180 / (9/10)</gadget>
<output>200</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">200 / (4/5)</gadget>
<output>250</output>

<result>250</result>