The price of antiviral drugs sold by a pharmacy has been increased by 100% when the market is in short supply. After investigation by the price department, the price increase is limited to 20% of the original price.
某药店经营的抗病毒药品，在市场紧缺的情况下提价100%，物价部门查处后，限定其提价的幅度只能是原价的20%，则该药品现在降价的幅度是多少．
<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

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

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2 - (6/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 2</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>