The retail price of a piece of clothing is 90 yuan, and you can make a profit of 50% after selling it. If you sell it at 20% off the retail price, how much profit can you make?
一件衣服的零售价90元，售出后可获利50%，如果按零售价的八折出售，可获利多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">90 * (4/5)</gadget>
<output>72</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">90 / (3/2)</gadget>
<output>60</output>

<gadget id="calculator">72 - 60</gadget>
<output>12</output>

<result>12</result>