12% reduction in the purchase price of a commodity will increase the profit margin by 18%. Q: What is the profit margin after the increase.
某商品进价如降低12%会使利润率提高18%．问：提高后的利润率是多少．
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">1 - (3/25)</gadget>
<output>22/25 = around 0.88</output>

<gadget id="calculator">1 * (22/25)</gadget>
<output>22/25 = around 0.88</output>

<gadget id="calculator">18 / 100</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">(9/50) * 1 * (22/25)</gadget>
<output>99/625 = around 0.1584</output>

<gadget id="calculator">(99/625) - (22/25)</gadget>
<output>-451/625 = around -0.7216</output>

<gadget id="calculator">(22/25) + (-451/625)</gadget>
<output>99/625 = around 0.1584</output>

<gadget id="calculator">1 - (22/25)</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">(99/625) / (3/25)</gadget>
<output>33/25 = around 1.32</output>

<gadget id="calculator">(33/25) - (22/25)</gadget>
<output>11/25 = around 0.44</output>

<gadget id="calculator">(11/25) / (22/25)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>