The mall buys a batch of shoes and makes a profit of 15 yuan for each pair sold. After selling (2/5), in order to speed up capital turnover, the mall decides to sell them at a 20% profit. After all the shoes are sold, the mall makes a total profit of 13,200 yuan. Q: How many pairs of shoes were sold in the mall?
商城购进一批鞋子，每卖出一双，获利15元，卖出(2/5)后，为加快资金周转，商城决定让利20%出售，全部卖出后，商城一共获利13200元．问：商城共卖出多少双鞋子？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 15</gadget>
<output>6</output>

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

<gadget id="calculator">(2/5) * 15 * (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">15 * (1/5)</gadget>
<output>3</output>

<gadget id="calculator">(6/5) - 3 - 6</gadget>
<output>-39/5 = around -7.8</output>

<gadget id="calculator">6 + 15 + (-39/5)</gadget>
<output>66/5 = around 13.2</output>

<gadget id="calculator">13_200 / (66/5)</gadget>
<output>1_000</output>

<result>1_000</result>