The profit of a certain commodity is 50%. If the purchase price is reduced by 50%, what is the profit rate of this commodity now?
某种商品的利润是50%，如果进货价降低50%，那么现在这种商品的利润率为多少．
<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">1 * (3/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 * (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/2) - (1/2)</gadget>
<output>1</output>

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<result>2</result>