If a coat is sold at a price of 180 yuan, a loss of 20% will be incurred. If you want to get a 20% profit, how much should you sell it for?
一件上衣，如果以180元的价格卖出，就要亏损20%．如果要想获得20%的利润，就应该卖多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">180 / (4/5)</gadget>
<output>225</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">225 * (6/5)</gadget>
<output>270</output>

<result>270</result>