A shopping mall buys a batch of sandals, and the selling price of each pair is 20% higher than the purchase price. If they sell all of them, they can make a profit of 1,600 yuan. If the remaining 80 pairs are not sold, the difference is 800 yuan. How much is the price per pair?
某商城购进一批凉鞋，每双售价比进价多20%，如果全部卖出，可获利1600元，还剩80双没卖出去，则差800元才能够成本，凉鞋的进价每双多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_600 / (1/5)</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 + 1_600</gadget>
<output>9_600</output>

<gadget id="calculator">8_000 - 800</gadget>
<output>7_200</output>

<gadget id="calculator">9_600 - 7_200</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 / 80</gadget>
<output>30</output>

<gadget id="calculator">120 / 100</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 / (6/5)</gadget>
<output>25</output>

<result>25</result>