A certain fruit shop bought a batch of fruits and priced them at a profit of 40%. When 80% of the batches of fruits were sold, in order to prevent the remaining fruits from spoiling, they decided to sell the remaining fruits at half the price. After the sale, what is the actual profit margin?
某水果店进了一批水果，按40%的利润来定价，当售出这批水果的80%后，为了防止余下的水果变质，决定剩下的水果按定价的一半出售，这批水果全部售完后，实际利润率是多少？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 * (7/5) * (4/5)</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">(7/5) / 2</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 * (7/10) * (1/5)</gadget>
<output>7/50 = around 0.14</output>

<gadget id="calculator">(28/25) + (7/50)</gadget>
<output>63/50 = around 1.26</output>

<gadget id="calculator">(63/50) - 1</gadget>
<output>13/50 = around 0.26</output>

<result>13/50 = around 0.26</result>