store bought a batch of notebooks and priced them at a 30% profit. When 80% of these notebooks are sold, in order to sell them out as soon as possible, the store sells these notebooks at half the price. What is the actual profit percentage of the store after the sale?
某商店进了一批笔记本，按30%的利润定价．当售出这批笔记本的80%后，为了尽早销完，商店把这批笔记本按定价的一半出售．问销完后商店实际获得的利润百分数是多少？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

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

<gadget id="calculator">1 * (13/10) * (4/5)</gadget>
<output>26/25 = around 1.04</output>

<gadget id="calculator">(13/10) / 2</gadget>
<output>13/20 = around 0.65</output>

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

<gadget id="calculator">1 * (13/20) * (1/5)</gadget>
<output>13/100 = around 0.13</output>

<gadget id="calculator">(26/25) + (13/100)</gadget>
<output>117/100 = around 1.17</output>

<gadget id="calculator">(117/100) - 1</gadget>
<output>17/100 = around 0.17</output>

<result>17/100 = around 0.17</result>