If you sell a coat for 69 yuan, you can earn 15%. If you sell it for 75 yuan, what percentage can you earn?
一件上衣如果卖69元，可赚15%，如果卖75元，可赚百分之几？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">69 / (23/20)</gadget>
<output>60</output>

<gadget id="calculator">75 - 60</gadget>
<output>15</output>

<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>