If you sell a cotton coat for 280 yuan, you can earn 40%. If you sell it for 240 yuan, how much can you earn?
一件棉衣，如卖280元，可赚40%，如卖240元，可赚多少
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">280 / (7/5)</gadget>
<output>200</output>

<gadget id="calculator">240 - 200</gadget>
<output>40</output>

<gadget id="calculator">40 / 200</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>