If you sell a piece of clothing for 140 yuan, you will lose 30%. If you sell it for 220 yuan, how much can you earn?
一件衣服如卖140元，则亏损30%，如果卖220元可以赚多少
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">140 / (7/10)</gadget>
<output>200</output>

<gadget id="calculator">220 - 200</gadget>
<output>20</output>

<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>