In order to make huge profits, an unscrupulous businessman first increases the price of the product by 200%, and then sells it at a 40% discount. How much profit can the businessman earn?
某不法商人为了牟取暴利，先将商品提价200%，再打六折出售，这个商人可赚取多少的利润．
<gadget id="calculator">200 / 100</gadget>
<output>2</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 * 2 * (3/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

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