The purchase price of a certain drug is 100 yuan, and the retail price is 120 yuan, what is the profit margin of the drug
某种药品的进价为100元，零售价为120元，该药品的利润率为多少
<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

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