If a commodity is sold at minus 5% of the price, a profit of 5250 yuan can be obtained; if it is sold at minus 25% of the price, it will lose 1750 yuan. How much is the purchase price of this item.
某种商品，以减去定价的5%卖出，可得5250元的利润；以减去定价的2成5卖出，就会亏损1750元．这个物品的购入价是多少元．
<gadget id="calculator">5_250 + 1_750</gadget>
<output>7_000</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(19/20) - (3/4)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7_000 / (1/5)</gadget>
<output>35_000</output>

<gadget id="calculator">35_000 * (19/20)</gadget>
<output>33_250</output>

<gadget id="calculator">33_250 - 5_250</gadget>
<output>28_000</output>

<result>28_000</result>