A leather jacket is sold at a 20% discount, which is 180 yuan cheaper than the original price. What is the original price?
一件皮衣打八折出售，比原价便宜了180元，原价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">180 / (1/5)</gadget>
<output>900</output>

<result>900</result>